Lab Values NCLEX

Question 1

Sodium Na+

Regulates fluid balance, nerve, and muscle function

Answer 1

135-145

a salt shaker has 135-145 grains of salt

Low: SIADH, CHF, fluid overload
High: Dehydration, Diabetes Insipidus, Aldosteronism

Tx: fluid correction, sodium suplementation or restriction

Question 2

Potassium K+

Regulates heart and muscle function and conduction of action potentials

Answer 2

3.5-5

there are usually 3-5 bananas in a bunch, want to buy them 1/2 off if we

Low: vomiting, diarrhea, diuretics
High: renal failure, acidosis, cell destruction

Tx: IV calcium, insulin/glucose, K+ replacement

Question 3

Calcium Ca2+

Bone, nerve and muscle function; clotting function

Answer 3

2.12-2.62 mmol/L

who drinks the most milk? kids between 2 and 12. Don’t stop till you rea

Low: excitability
High: sedative effects

Low: pancreatitis, chronic kidney disease, Vit D deficiency
High: cancer, hyperparathyroidism

Tx: IV fluids (hyper), calcium gluconate (hypo)

Question 4

Magnesium Mg2+

Neuromuscular function, cardiac rhythm stabilization

Answer 4

0.65-1.05

a small britich MG car fits between 0.65 and 1.05 people in it.

Low: lcogolism, diarrhea, diuretics
High: renal failure, antacid/laxative use

Tx: Calcium gluconate (hyper), magnesium sulfate (hypo)
** think shift magnesium out of the cells or cupply it to the cells

Question 5

Phosphorous PO4-

Bone strength and formation, ATP/energy metabolism

Answer 5

2.5-4.5

Phos’4’us- 4 is in the middle

Low: refeeding syndrome, alcoholism
High: renal failure, hypoparathyroidism

Tx: phosphate binders or supplementation

Phosphate binders:
Calcium carbonate (Alka-Seltzer® or Tums®).
Sucroferric oxyhydroxide (Velphoro®).
Sevelamer (Renvela® or Renagel®).
Lanthanum carbonate (Fosrenol®).
Calcium acetate (PhosLo®, Phoslyra®, Eliphos® or Calphron®).

Question 6

BNP (B-type Natriuretic Peptide)

Ventricular stretch marker- regulates BP/fluid balance

Answer 6

< 100 ng/L

Be Nearly Perfect= 100

Low: normal, no cardiac strain
High: CHF, fluid overload
Tx: diuretics, treat CHF
Sig: >500 strongly suggests CHF

Question 7

Troponin

Cardiac injury marker- secreted when muscle is damaged

Answer 7

I: < 40ng/L.
HS: Female < 15
HS: Male < 20

We have Tea at 4pm, but its usually 15 or 20 past the hour

Low: normal, no injury
High: MI, myocarditis, trauma
Tx: cardiac protocol, serial testing
Sig: gold standard for MI detection

Question 8

Lactate

Indicator of tissue hypoxia/shock

Answer 8

0.5-2.2

Half to the baby, and 2.2 breasts

Low: no concern, good perfusion
High: sepsis, shock, ischemia
Tx: address shock source, fluids, antibiotics
Sig: Lactate >4 = severe sepsis/shock risk

Question 9

Anion Gap (Na+ - Cl- + HCO3-)

Assessment of the balance of electrolytes in blood

Answer 9

8-16 mEq/L

always fear the gap between 8 and 16 years old

Low: rare, hypoalbuminemia
High: DKA, lactic acidosis, toxins- suggests presence of unmeasured anions (lactate, ketones, toxins), metablic acidosis
Tx: treat underlying cause
Sig: measures difference in + (cations) and - (anions) ions

Question 10

Serum Osmolality

Concentration of solutes in the blood; Balance between water and chemicals in the body

Answer 10

275-295 mmol/kg

osmo salt always has double the sodium

Low: SIADH, overhydration
High: dehydration, DI, hypernatremia
Tx: fluid correction
Sig: used to guide fluid therapy, monitor kidney functioning alongside ADH level

Question 11

D-Dimer

Fibrin degradation product; Clot marker

Answer 11

< 500 ng/mL

d-dimer is hot, below 500 there’s no clot!

Low: normal, unlikely clot
High: DVT, PE, DIC, surgery, trauma
Tx: CT angio or doppler if high, anticoagulants
Sig: negative rules out clot in low-risk patient

Question 12

RBC

Measure of concentration of red blood cells (erythrocytes)

Answer 12

Adult: 4.2-6.2 million
Child: 3.2-5.2 million

four-two, six-two

Low: anemia
High (erythrocytosis): clot risk, high altitude, COPD, dehydration, bone marrow dx. polycythemia vera
Tx: transfusion if symtomatic or critical (blood or iron products)
Sig: pre-op clearance, oxygen delivery to tissues, clot risk

Question 13

WBC

Measure of concentration of leukocytes in the blood

Answer 13

Adult: 4,500-11,000
Child: 5,000-13,000

used white cars cost between 4.5-11 thousand

Low: immune issues, autoimmune dx, chemotherapy, liver/spleen issues
High: Infection, inflammation, stress, autoimmune dx
Tx: target root cause- possibly ABO therapy
Sig: issues with or activity of the immune system fighting infection

Question 14

HGB

Measure of iron protein that carries oxygen to tissues and CO2 away from tissues

Answer 14

Adult: 120-180
Child: 110-125

Blood pressure is 120/80, add a 1(80).

Low: Anemia, bleeding
High: dehydration, COPD
Tx: transfusion if symptomatic or critical
Sig: oxygen carrying capacity to supply tissues

Question 15

HCT

Measure of the percentage of blood volume made up of red blood cells

Answer 15

Adult: 0.35-0.52 or 35-52%
Child: 0.35-0.45 or 35-45%

For HCT call 35-52

Low: anemia, bleeding, leukemia, kidney disease, pregnancy
high: dehydration, COPD, heart disease, kidney issues, living at high altitude
Tx: transfusion if symptomatic or critical
Sig: oxygen carrying capacity to supply tissues

Question 16

PTT

Measures blood clotting time along the intrinsic pathway- heparin therapy

Answer 16

25-35 sec

PTT takes atleast a quarter, if not 35 cents

Low: clotting risk
High: haparin, DIC, hemophilia
Tx: protamine sulfate (high), anticoagulation (low)
Sig: monitor during heparin therapy

Question 17

Platelets

Measure of clot formation ability

Answer 17

150-450

150-450 platelets alive

Low: DIC, heparin-induced thrombocytopenia (HIT)
High: cancer, inflammation
Tx: platelet transfusion (low), anticoagulation (high)
Sig: low= bleeding risk during surgery & procedures, inability to clot

Question 18

PT

Measure of clotting time on the extrinsic pathway

Answer 18

9.5-12 sec

my Personal Trainer has 9-12 years of experience

Low: vitamin K excess
High: warfarin, liver failure, DIC
Tx: Vit K, fresh-frozen plasma, reversal agents (protamine sulfate)
Sig: must monitor before surgery

Question 19

INR

Standardized measure of how long it takes blood to clot

Answer 19

1 sec
2-3 sec with therapy
2.5-3.5 with prosthetic heart valves

1 is the one, unless you’re in group therapy

Low: vitamin K excess
High: warfarin, liver failure, DIC
Tx: Vit K, fresh-frozen plasma, reversal agents (protamine sulfate)
Sig: must monitor before surgery, correction of blood thinner doses

Question 20

ESR (erythrocyte sedimentation rate)

tests how fast RBC’s settle in a tube- indicating inflammation in the body

Answer 20

Male <50 yrs: <15mm/h

Male >50yrs: <20mm/h

Female <50 yrs: <25mm/h

Female >50 yrs: <30mm/h

15, 20, 25, 30

Low: normal or sickle cell disease, polycythemia
High: indicates inflammation or infection in the body but isn’t specific

Question 21

GTT (glucose tolerance test)

measures how your body uses sugar (glucose) for energy, diagnosing conditions like diabetes, prediabetes, and gestational diabetes

Answer 21

Fasting: 3.9-5.5
1 hr: 10.5
2 hr: 7.8
3 hr: 6.9

4-5.5, you’re alive; 10.5 time to dive; 7.8 is at the gate for the 2-hour wait; 6.9 cuts off at 3-hours

Checks Glucose Processing: The GTT assesses your body’s ability to move glucose from your blood into tissues for energy and storage.

Diagnoses Diabetes: It helps diagnose type 2 diabetes and prediabetes.

Screens for Gestational Diabetes: It’s commonly used to check for diabetes that develops during pregnancy (gestational diabetes).

Question 22

Total Cholesterol

measures total cholesterol in your blood, including “good” HDL, “bad” LDL, and VLDL (from triglycerides), indicating your risk for heart disease

Answer 22

3.9-5.2 mmol/L

I need a 3.9 GPA to live for all 52 weeks of the year

High cholesterol contributes to plaque buildup, increasing risk for heart disease, heart attack, and stroke.
A high total number isn’t the whole story; your doctor looks at the breakdown (LDL/HDL ratio) and other risk factors like diabetes, smoking, and blood pressure.

Question 23

LDL

Low-Density Lipoprotein, is often called “bad” cholesterol because it carries cholesterol to cells, and excess LDL can build up in artery walls, forming plaque that hardens and narrows arteries, increasing the risk of heart attack and stroke.

Answer 23

2.6-4.1

two-six is low-risk, four-one is the high one.

Transports cholesterol: LDL particles are responsible for delivering cholesterol from the liver to the body’s cells, where it’s used for cell repair and hormone production.

Forms plaque: When there’s too much LDL, it can deposit cholesterol in artery walls, creating fatty buildups called plaque (atherosclerosis).

Increases risk: Plaque can block blood flow, potentially leading to heart attacks (coronary arteries) or strokes (carotid arteries).

Question 24

HDL

High-Density Lipoprotein, is known as “good” cholesterol because it picks up excess cholesterol from your body and arteries, transporting it back to the liver for removal, which helps prevent heart disease, heart attacks, and strokes

Answer 24

Male: 0.91-1.8
Female: 0.91-2.2

Healthy to have between 0.91 and 2.2 salads per day

Removes Cholesterol: It acts like a scavenger, taking LDL (“bad”) cholesterol from the bloodstream and artery walls to the liver.

Prevents Buildup: By removing cholesterol, it helps prevent plaque formation in arteries (atherosclerosis).

Protects Vessels: It offers anti-inflammatory and antioxidant effects, protecting blood vessels.

Question 25

Creatinine ## Footnote A normal waste product from muscle use, filtered from the blood by healthy kidneys and removed in urine; its level in the blood indicates kidney function, with high levels often signaling kidney damage or disease, measured by blood/urine tests like serum creatinine or estimated GFR (eGFR).

Answer 25

Adult: 60-120 Child: 35-100 Infant: 25-50 | 50-100 generally in the clear, half for infants ## Footnote High Levels: Can mean kidneys aren't working well (kidney disease/damage). Low Levels: May indicate low muscle mass, malnutrition, or certain muscle diseases. Factors affecting levels Muscle mass (more muscle = more creatinine) Age, sex, race/ethnicity Diet (protein intake) Activity level Certain medications.

Question 26

ALP (Alkaline Phosphatase) ## Footnote ALP blood test checks levels to help diagnose liver disease, bone disorders (like fractures or Paget's disease), or vitamin D deficiency It is an enzyme (protein) that speeds up chemical reactions, helping to remove phosphate groups from molecules. Exists as different "isoenzymes" in various tissues, with high concentrations in the liver and bone.

Answer 26

40-145 u/L | 40 up, 145 down ## Footnote What high levels mean Liver: Blocked bile ducts, liver disease. Bones: Rapid growth (puberty), healing fractures, Paget's disease, bone cancer, hyperparathyroidism. Other: Pregnancy (placental ALP), certain infections. What low levels mean Malnutrition: Celiac disease, zinc/magnesium deficiency. Genetic: A rare disorder called hypophosphatasia (fragile bones). Other: Wilson's disease, protein deficiency.

Question 27

CK (creatinine kinase) ## Footnote measures the enzyme CK in your blood, primarily to detect muscle damage from injury, disease (like muscular dystrophy), or issues with the heart or brain, as high levels leak from damaged cells into the bloodstream

Answer 27

MM bands= skeletal muscle damage MB bands= heart muscle damage BB bands= brain damage | **M**ust **B**e Cardiac, **B**aby **B**rain, **M**assive **M**uscle ## Footnote Significantly high levels indicate muscle damage but not the exact cause or location. Increasing levels suggest ongoing damage, while decreasing levels can show improvement.

Question 28

Serum Albumin ## Footnote An albumin blood test assesses general health, nutrition, and liver/kidney function.

Answer 28

35-55 | A small photo **Album** holds 35-55 pictures ## Footnote Albumin is the most abundant protein in blood plasma, made by the liver, crucial for maintaining fluid balance (oncotic pressure) between vessels and tissues, and transporting substances like hormones, drugs, and fatty acids throughout the body. Low Levels: Liver disease (decreased production), kidney disease (loss in urine), poor nutrition, inflammation, heart failure (fluid overload makes levels seem low). High Levels: Dehydration, metabolic syndrome.

Question 29

Triglycerides ## Footnote measures the fat in your blood, usually part of a routine lipid panel, to assess heart disease risk

Answer 29

1.13-2.26 | 1-1-3 is a bit too free, up to 2-2-6, fix your mix. ## Footnote To monitor treatment for high cholesterol or triglycerides. To assess risk for heart issues, especially with diabetes or family history.

Question 30

BUN (blood urea nitrogen) ## Footnote measures urea nitrogen in your blood, a waste product from protein breakdown, indicating how well your kidneys and liver are functioning, and can also detect dehydration or other issues like heart failure or GI bleeding

Answer 30

3.57-7.14 | Hamburger **BUN**'s cost between $3.57 and $7.14 ## Footnote High BUN: Kidney problems, dehydration, high-protein diet, heart failure, GI bleeding, burns, or certain medications. Low BUN: Malnutrition or liver damage.

Question 31

ALT (alanine aminotransferinase) ## Footnote measures levels of the enzyme ALT, primarily found in the liver, to check for liver damage or disease

Answer 31

7-56 units | Live life healthy from age 7, so you can live past 56. ## Footnote liver injury releases this enzyme into the bloodstream, causing levels to rise. It's often part of a liver panel with other tests like AST to diagnose conditions like hepatitis, cirrhosis, or monitor medications High levels: Suggest liver damage from hepatitis, fatty liver, alcohol, or certain drugs (like acetaminophen). Very high levels: Can point to acute issues like severe viral hepatitis or drug toxicity.

Question 32

AST (aspartate aminotransferinase) ## Footnote measures this enzyme in your blood, primarily to check for liver damage or disease, as damaged liver cells release AST into the bloodstream

Answer 32

10-40 units |**A**ll **S**ay **T**en to Forty ## Footnote Most commonly used to diagnose or monitor liver conditions like hepatitis or cirrhosis. Can help diagnose damage to the heart, muscles, pancreas, or kidneys. What high levels mean Liver Issues: Hepatitis, cirrhosis, liver injury from alcohol or medications. Heart Problems: Heart attack or heart failure. Muscle Damage: Severe injury or strenuous exercise. Other: Mononucleosis, pancreatitis, or certain cancers

Question 33

Ammonia ## Footnote measures the level of ammonia in the blood, a toxic byproduct of protein breakdown, to diagnose liver disease, kidney failure, Reye's syndrome, or metabolic disorders

Answer 33

15-45 mcg/dL | 15 to 45, ammonia thrives ## Footnote Why It's Done (Indications) Liver Disease: To diagnose or monitor severe liver conditions like cirrhosis or hepatitis, or hepatic encephalopathy (brain dysfunction from liver failure). Neurological Symptoms: For unexplained confusion, coma, lethargy, mood swings, or loss of coordination. Metabolic Disorders: To investigate inborn errors of metabolism or Reye's syndrome in children, especially after a viral illness. What High Levels Mean Liver failure or damage (most common cause), Kidney failure, Certain genetic conditions (urea cycle disorders), and Some medications.

Question 34

Bilirubin ## Footnote measures the yellow pigment bilirubin in your blood or urine, which indicates how well your liver is processing old red blood cells

Answer 34

Total: 0.3-1.0 Conjugated (direct): 0.1-0.4 Unconjugated: 0.2-0.6 | 0.3-1, bilirubin is done ## Footnote high levels can signal liver disease, bile duct blockage, or excessive red blood cell breakdown, often causing jaundice (yellow skin/eyes), and is common in newborns needing monitoring Normal Levels: Indicate proper liver function and red blood cell turnover. High Total Bilirubin: May suggest liver damage, bile duct obstruction, or other conditions like Gilbert's syndrome (usually harmless). High Direct (conjugated) Bilirubin: Often points to the liver's inability to clear bilirubin, suggesting liver disease or blockages. High Indirect Bilirubin: Can indicate increased red blood cell breakdown or Gilbert's syndrome.

Question 35

Amylase ## Footnote measures the level of amylase, a digestive enzyme from the pancreas and salivary glands, in your blood or urine- Diagnose and monitor acute and chronic pancreatitis, salivary gland issues, alcoholism, or certain kidney diseases (low levels).

Answer 35

60-100 u/dL | a meal takes 60-100 minutes to break down ## Footnote High Levels: Often points to pancreatitis (inflammation of the pancreas) or blocked salivary glands. Low Levels: Can indicate issues like kidney disease or preeclampsia in pregnancy. Influencing Factors: Medications (aspirin, opiates) and alcohol can affect results.

Question 36

Lipase ## Footnote measures the digestive enzyme lipase in your blood, primarily to diagnose and monitor pancreatic conditions, especially acute pancreatitis, as damaged pancreas cells release large amounts of it.

Answer 36

<200 u/mL | <200 **Lipase** a day keeps the pancreas at bay ## Footnote helps identify issues like inflammation, blockage, cysts, or cancer, and can also signal other problems like kidney disease, intestine issues, or even certain infections or Pancreatic cysts, gallstones, intestinal blockage, kidney failure, peptic ulcers, and salivary gland problems. Normal levels: A small amount of lipase is normal as it helps digest fats. Normal ranges vary but are often around 0-160 U/L for adults. High levels: Indicate pancreatic damage or blockage, but also could point to kidney disease, bowel issues, or other conditions. Low levels: Less common, but can be linked to certain genetic disorders like familial lipoprotein lipase deficiency or issues with lipid metabolism

Question 37

Gastric Aspirate ## Footnote collects stomach fluid via a nasogastric tube to diagnose conditions like tuberculosis (TB) in young children or non-tuberculous mycobacterial (NTM) infections, and check for NG tube placement and feeding tolerance

Answer 37

1-5.5 pH = proper NG tube placement | **1-5.5** makes the tube fine ## Footnote Key Considerations: Timing: Best collected first thing in the morning after overnight sleep for TB diagnosis. Multiple Samples: Three samples are often collected for better diagnostic yield. pH Check: For tube placement confirmation (for feeding), a pH strip confirms the tube is in the stomach (pH 1-5.5). Limitations: A negative result doesn't rule out TB, but positive results are very useful.

Question 38

ABG's: pH ## Footnote It's a direct measure of blood acidity or alkalinity, vital for cellular function.

Answer 38

Norm: 7.35-7.45 Acidosis: <7.35 Alkalosis: >7.45 ## Footnote Diagnoses Conditions: Helps identify lung problems (like pneumonia) or kidney disorders that affect pH. Guides Treatment: Shows if treatments for breathing or kidney issues are working to normalize acid-base balance. PaCO2 (Respiratory): If pH drops and PaCO2 rises (opposite directions), it's a respiratory issue. HCO3 (Metabolic): If pH drops and HCO3 drops (same direction), it's a metabolic issue.

Question 39

ABG's: PaO2 ## Footnote measures the oxygen dissolved in your arterial blood indicating how effectively your lungs transfer oxygen to the blood

Answer 39

80-100 mmHg | I need to score 80-100 to oxygenate my tissues ## Footnote Low PaO2 (Hypoxemia): Below 80 mmHg, indicating the blood isn't getting enough oxygen, often due to lung conditions like COPD, pneumonia, or heart issues. Very Low (e.g., < 50 mmHg): Can signal severe issues like Acute Respiratory Distress Syndrome (ARDS).

Question 40

ABG's: SaO2 ## Footnote measures blood oxygen saturation (SaO2) showing the percentage of hemoglobin carrying oxygen, typically 95-100% in healthy people

Answer 40

95-100% ## Footnote ABG is more precise; SpO2 has a margin of error (around 2%) and can be less reliable in certain conditions, like poor circulation or carbon monoxide poisoning

Question 41

ABG's: PaCO2 ## Footnote measures the amount of CO2 in arterial blood, reflecting your body's ventilation

Answer 41

Norm: 35-45 mmHg Acidosis: > 45 mmHg Alkalosis: <35 mmHg | pH is 7.**35** to 7.**45** ## Footnote High PaCO2 (>45 mmHg): Called hypercapnia, often caused by hypoventilation (slow/shallow breathing), indicating poor gas exchange or respiratory failure. Low PaCO2 (<35 mmHg): Called hypocapnia, often from hyperventilation (fast/deep breathing), blowing off too much CO2.

Question 42

ABG's: HCO3 (bicarb) ## Footnote HCO3 represents the metabolic component, regulated by the kidneys, indicating if the body has too much or too little acid/base

Answer 42

Norm: 22-26 mEq/L Acidosis: <22 mEq/L Alkalosis: >26 mEq/L | **22** and **26** make a perfect mix (bicarb buffers) ## Footnote What HCO3 (Bicarbonate) Measures in an ABG Electrolyte: Bicarbonate is a key electrolyte that helps control fluid balance and pH. Metabolic Buffer: It's the body's primary metabolic buffer, formed from carbon dioxide and regulated by the kidneys. Metabolic Component: Changes in HCO3 reflect metabolic problems (kidney function, severe diarrhea, DKA) rather than respiratory issues (lungs/CO2). Common Causes of Abnormal HCO3 Metabolic Acidosis: Renal failure, lactic acidosis, diabetic ketoacidosis (DKA). Metabolic Alkalosis: Severe vomiting, diuretics.

Question 43

VBG's: pH ## Footnote refers to the pH level in a Venous Blood Gas test, indicating the acidity or alkalinity of venous blood

Answer 43

Norm: 7.29-7.43 Acidosis: <7.29 Alkalosis: >7.43 | Veins are acidic from **29-43** ## Footnote VBGs are common in emergency settings as a less invasive alternative to Arterial Blood Gases (ABGs) for: Monitoring patients with sepsis, metabolic emergencies (like diabetic ketoacidosis), or overdose. Assessing respiratory function and acid-base balance. Limitations Not for Oxygenation: VBGs don't accurately measure oxygenation (pO2) because venous blood is naturally low in oxygen; an ABG is needed for that. Shock: VBG interpretation can be less reliable in severe shock or profound hemodynamic compromise.

Question 44

VBG's: PO2 ## Footnote Partial Pressure of Oxygen in a Venous Blood Gas, indicating oxygen in the deoxygenated blood returning to the heart, which reflects tissue oxygen extraction rather than lung oxygenation

Answer 44

25-70 mmHg | we measure venous oxygen at a **quarter** (25) to **7** (70) ## Footnote VBGs are common in emergency settings as a less invasive alternative to Arterial Blood Gases (ABGs) for: Monitoring patients with sepsis, metabolic emergencies (like diabetic ketoacidosis), or overdose. Assessing respiratory function and acid-base balance. Limitations Not for Oxygenation: VBGs don't accurately measure oxygenation (pO2) because venous blood is naturally low in oxygen; an ABG is needed for that. Shock: VBG interpretation can be less reliable in severe shock or profound hemodynamic compromise.

Question 45

VBG's: PCO2 ## Footnote Partial Pressure of Carbon Dioxide measured in a Venous Blood Gas test, indicating how well the lungs are removing CO2

Answer 45

35-59 mmHg | venous CO2 is higher, 3559 ## Footnote VBGs are common in emergency settings as a less invasive alternative to Arterial Blood Gases (ABGs) for: Monitoring patients with sepsis, metabolic emergencies (like diabetic ketoacidosis), or overdose. Assessing respiratory function and acid-base balance. Limitations Not for Oxygenation: VBGs don't accurately measure oxygenation (pO2) because venous blood is naturally low in oxygen; an ABG is needed for that. Shock: VBG interpretation can be less reliable in severe shock or profound hemodynamic compromise.

Question 46

VBG's: HCO3 (bicarb) ## Footnote bicarbonate level measured in a Venous Blood Gas (VBG), a calculation indicating the body's acid-base balance and kidney function, often estimated from the pH and pCO2 using the Henderson-Hasselbalch equation

Answer 46

22-30 mmHg | **V**enous **B**icarb **G**oes **H**igher 22-30 ## Footnote In a VBG, HCO3- is often calculated (estimated) from pH and pCO2, unlike a BMP where it's measured directly, providing insight into kidney compensation. VBGs are common in emergency settings as a less invasive alternative to Arterial Blood Gases (ABGs) for: Monitoring patients with sepsis, metabolic emergencies (like diabetic ketoacidosis), or overdose. Assessing respiratory function and acid-base balance. Limitations Not for Oxygenation: VBGs don't accurately measure oxygenation (pO2) because venous blood is naturally low in oxygen; an ABG is needed for that. Shock: VBG interpretation can be less reliable in severe shock or profound hemodynamic compromise.

Question 47

VBG's: SO2

Answer 47

68-77% | Veins like a 60's/70's mix ## Footnote VBGs are common in emergency settings as a less invasive alternative to Arterial Blood Gases (ABGs) for: Monitoring patients with sepsis, metabolic emergencies (like diabetic ketoacidosis), or overdose. Assessing respiratory function and acid-base balance. Limitations Not for Oxygenation: VBGs don't accurately measure oxygenation (pO2) because venous blood is naturally low in oxygen; an ABG is needed for that. Shock: VBG interpretation can be less reliable in severe shock or profound hemodynamic compromise.

Question 48

What happens with a Sodium imbalance?

Answer 48

Neuro symptoms (seizures, confusion) ## Footnote **S**- eizures **A**- abd cramping/anorexia **L**- ethargy **T**- endon reflexes diminished **HYPO** **L**- imp muscles **O**-rthostatic hypotension **S**- hallow respirations **S**- eizures/spasms **F**- lushed skin/fever **R**- estless/Irritable **I**- ncreased BP/Fluid retention **E**- dema **D**- ecreased urine output/dry mouth **HYPER** **S**- kin flushed **A**- gitation **L**- low-grade fever **T**- hirst

Question 49

What happens with a Potassium imbalance?

Answer 49

Dysrhythmias- monitor EKG closely ## Footnote Hypokalemia 6 **L**'s: **L**ethargy, **L**eg cramps, **L**ymph muscles, **L**ow shallow resps, **L**ethal cardiac rhythms, **L**ots of urine. Arrhythmias: Premature ventricular contractions (PVCs), atrial fibrillation/flutter, supraventricular tachycardia, Torsades de Pointes, ventricular tachycardia, ventricular fibrillation. ECG Clues: Flattened or inverted T waves, prominent U waves, prolonged QT interval, ST segment depression. Mechanism: Reduces repolarization reserve, increases intracellular calcium, promoting triggered arrhythmias. Hyperkalemia MURDER: **M**uscle weakness, **U**rine (anuria), **R**espiratory distress, **D**ecreased cardiac contractility, **E**cg changes, **R**eflexes decreased Arrhythmias: Sinus bradycardia/tachycardia, heart blocks, ventricular tachycardia, ventricular fibrillation, asystole. ECG Clues: Peaked (tented) T waves, flattened P waves, prolonged PR interval, widened QRS complex, leading to a "sine wave" pattern in severe cases. Mechanism: Decreases resting membrane potential, inactivates sodium channels, slowing conduction and increasing risk of lethal arrhythmias.

Question 50

What happens with a Calcium imbalance?

Answer 50

Trousseau's + Chvostek's sign (hypocalcemia) ## Footnote HYPO: **C**onvulsions **A**rrhythmias **T**etany **S**pasms HYPER: **C**onfusion **R**eflexes hyperactive **A**rrhythmias **M**uscle spasms **P**ositive Trousseau's/Chvostek's signs **S**tridor Chvostek's and Trousseau's signs are classic clinical indicators of hypocalcemia (low calcium levels), signaling increased neuromuscular excitability, with Chvostek's sign being facial twitching from tapping the facial nerve and Trousseau's sign being carpopedal spasm (hand/foot muscle contractions) from inflating a blood pressure cuff. Chvostek's Sign What it is: Twitching of facial muscles. How it's tested: A healthcare provider taps lightly on the facial nerve, located just in front of the ear. Positive sign: Facial muscles contract or twitch in response to the tap. Trousseau's Sign What it is: Involuntary spasm in the hand and wrist (carpopedal spasm). How it's tested: A blood pressure cuff is inflated on the upper arm to above systolic pressure for a few minutes (usually 2-3 minutes). Positive sign: Fingers and thumb flex, and the wrist flexes (hand curls) due to temporary lack of blood flow (ischemia). Why They Matter Both signs point to hypocalcemia, often caused by hypoparathyroidism or vitamin D deficiency, but also potentially by kidney issues or pancreatitis. They can also appear with electrolyte imbalances like low magnesium, which increases nerve sensitivity. Sensitivity: Trousseau's sign is more reliable (94% sensitive) for hypocalcemia than Chvostek's (which is absent in many with low calcium and present in some without). Dangers of Low Calcium (Hypocalcemia) Nervous System: Tingling/numbness (fingers, toes, lips), muscle cramps/spasms, seizures, confusion, memory loss, depression, hallucinations. Bones: Weak, brittle bones (osteopenia, osteoporosis), increased fracture risk, brittle nails, coarse hair. Heart: Abnormal heart rhythms, potential congestive heart failure. Other: Dry skin, dental issues (decay, brittle teeth), difficulty breathing (laryngospasm). Dangers of High Calcium (Hypercalcemia) Kidneys: Kidney stones, increased urination (polyuria). Gastrointestinal: Nausea, vomiting, constipation, abdominal pain. Brain: Confusion, fatigue, depression, altered mental status. Bones/Muscles: Weakness, bone pain. Heart: Can cause severe arrhythmias.

Question 51

What happens with a Magnesium imbalance?

Answer 51

Torsades de pointes (hypo) | Magnesium mellows, Calcium glues muscles down ## Footnote HYPO: **T**rousseau's sign **W**eak resps **I**rritability **T**orsades de pointes **C**ramps **H**ypertension, hyperreflexia **I**nvoluntary movements **N**ausea **G**I symptoms HYPER: **L**ethargy **E**KG changes **T**endon reflexes diminished **H**ypotension **A**rrhythmias **R**espiratory arrest **G**I upset **I**mpaired breathing **C**ardiac arrest TREATMENT: **H**emodialysis (filters excess) **I**V Calcium Gluconate (reverses neuromuscular effects) **M**onitor for low labs and absent deep tendon reflexes Hypomagnesemia Neuromuscular Issues: Muscle spasms, twitching (especially eyelids), tremors, weakness, numbness, tingling, and even seizures. Heart Problems: Irregular heartbeats (arrhythmias), coronary artery spasms, and in severe cases, cardiac arrest. Mineral Imbalances: Can cause low calcium (hypocalcemia) and low potassium (hypokalemia) Chronic Disease Risk: Linked to hypertension, cardiovascular disease, Type 2 diabetes, osteoporosis, and migraines. Mental Health: Associated with depression, anxiety, and ADHD. Hypermagnesemia Cardiovascular: Low blood pressure (hypotension) and other heart effects. Neuromuscular: Can cause drowsiness, muscle weakness, decreased reflexes, and paralysis. Other: Nausea, vomiting, flushing, and breathing difficulties.

Question 52

What happens with a Phosphate imbalance?

Answer 52

Weakness and respiratory failure | Phosphate "fights" with Calcium (one up, other down) ## Footnote Tx: PhosLo (Calcium Acetate) lower phosphate to raise calcium HYPO: **W**eakness **E**KG changes **A**ching bones **K**illed (impaired) respiratory/muscle function HYPER: **C**onvulsions **H**yperactive reflexes **E**KG changes **S**pasms/stridor (**Trousseau/Chvostek** signs) **T**etany Hypophosphatemia When phosphate levels are too low, it affects energy production (ATP) and bone mineralization. Neurological: Confusion, irritability, numbness, seizures, coma, encephalopathy. Muscular: Weakness, cramps, rhabdomyolysis (muscle breakdown), respiratory muscle weakness. Skeletal: Bone pain, softened bones (osteomalacia), fractures. Blood/Other: Anemia, impaired immune function, loss of appetite, metabolic issues. Hyperphosphatemia Elevated phosphate levels often occur with kidney disease and can cause calcium to deposit in tissues. Calcium Deposits: Hard lumps (calcifications) in skin, joints, and soft tissues, leading to itching (pruritus) and pain. Bone & Joint: Bone pain, increased risk of fractures. Kidney Issues: Worsened kidney function (especially in kidney disease).

Question 53

What does the ABG acronym ROME stand for?

Answer 53

Respiratory Opposite, Metabolic Equal ## Footnote the respiratory component (PaCO2) moves in the opposite direction of the pH if the respiratory system is causing the imbalance. Respiratory=opposite: high pH + low PCO2= Alkalosis low pH + high PCO2- Acidosis Metabolic=equal: high pH + high HCO3= Alkalosis low pH + low HCO3= Acidosis

Question 54

Chloride ## Footnote regulates fluid inside and outside cells and helps control blood volume

Answer 54

95-105 mmol/L | a hot tub is typically kept between 95-105 degrees farenheit ## Footnote Hypochloremia: Can result from severe vomiting, diarrhea, or fluid loss, leading to metabolic alkalosis. Hyperchloremia: Can occur with dehydration (e.g., from fever, burns, diuretics) or high salt intake, causing symptoms like bloating, high blood pressure, or confusion. Tx: fluid replacement, loop diuretics, dialysis, sodium bicarb for hyperchloremic metabolic acidosis.

Question 55

What causes Chvostek/Trousseau signs to appear?

Answer 55

Hypocalcemia, Hypomagnesemia, Hypoparathyroid, Hyperphosphatemia, biphosphenates, Phenytoin and Phenobarbitol (anticonvulsants), Furosemide (diuretic), Vit D deficiency, chronic kidney disease, pancreatitis | Anything lowering calcium ## Footnote PPI's, chemotherapy, calcitonin, phosphate infusions can also lower calcium levels and result in both signs

Question 56

What is Chvostek's sign?

Answer 56

Indicator of neuromuscular excitability indicated by ipsilateral (same side) contraction of facial muscles in response to tapping the facial nerve ## Footnote clinical indicator of increased neuromuscular excitability, usually caused by hypocalcemia (low calcium) or sometimes low magnesium. A positive sign is defined by twitching of the facial muscles (nose, lips, or eye) in response to tapping over the facial nerve just anterior to the ear.

Question 57

What is Trousseau's sign?

Answer 57

Indicator of latent tetany (increased neuromuscular excitability due to low calcium) characterized by involuntary spasm of hand/wrist when a BP cuff is inflated above SYS pressure for a few minutes ## Footnote clinical indicator of low blood calcium (hypocalcemia), characterized by involuntary spasms of the hand and wrist (carpopedal spasm) when a blood pressure cuff is inflated above systolic pressure for a few minutes, causing neuromuscular irritability