Module 5 : OB Introduction

Question 1

first trimester length

Answer 1

0 - 13 weeks 6 days LMP ( 13 6/7 weeks)

Question 2

why ultrasound for OB

Answer 2

- can confirm viability 
   \+ fetal heart activity 
- dating 
   \+ crown rump measurement (CRL)
- number of embryos
   \+ twins, triplets, etc

Question 3

importance of dating

Answer 3

• LMP used to calculate how many weeks and days a pregnancy is
• some menstrual cycles last longer than 28 days, others are shorter
• so we use first day of LMP because it is most accurate
• only certain testing done at specific times
• inaccurate dates lead to false positives or negatives

Question 4

first trimester screening tests

Answer 4

• nuchal translucency test

- maternal blood work

Question 5

nuchal translucency test

Answer 5

• tested before 14 weeks LMP

- measures amount of fluid behind baby’s neck ( over 3mm abnormal)

Question 6

nuchal translucency assessment

Answer 6

can asses for

• chromosomal abnormalities
• heart abnormalities
• lung abnormalities
• skeletal abnormalities
• congenital infections
• blood disorders
• metabolic disorders

Question 7

second trimester

Answer 7

14 weeks - 27 weeks 6 days LMP

* ALL ABOUT STRUCUTRES

Question 8

second trimester screening

Answer 8

• 18 week detailed ultrasound
• all measurements and structures
• head, spine, abdomen, chest, femur, humerus, Anke, hand, placenta, umbilical chord, maternal uterus and cervix

Question 9

third trimester

Answer 9

28 weeks - 40 completed (41) weeks LMP

- monitering growth

Question 10

third trimester screening

Answer 10

• anatomy images not reassessed if normal
• monitoring for fetal well being (safe environment)
• measure for growth
• fetal heart rate
• biophysical profile
• placenta
• doppler if needed
• vessel samples

Question 11

maternal testing - blood work

Answer 11

- first trimester screen + Nuchal 
   \+ PAPPA and hCG
- 16 weeks
   \+ triple screen and quad screen
- 24-28 weeks
   \+ glucose tolerance screen 
         - gestational diabetes

Question 12

routine doctor visits

Answer 12

• maternal weight, BP, urine
• uterine fundal height measurements
• position of baby
• fetal heart rate
• monthly at beginning - every 2 weeks if normal till 36 weeks - weekly if normal till term
• post dates ( overdue) require ultrasounds to check fetal well being and growth