Math Formulas

Question 1

Clarks rule is used to determine

Answer 1

Pediatric dose based on weight of child in pounds.

              Childs weight in pounds
               ———————————— x adult dose = child dose
                            150

Question 2

Fried’s rule is used to determine

Answer 2

An infant’s dose based on child’s age in months. If the infant is between 1 - 30 days used 1 month.

      Age in months X adult dose
     ———————————————- = infant dose 
                       150

Question 3

Young’s rule is used to

Answer 3

Determine a child’s dose based on the child’s age in years.

        Age in years X adult dose
      —————————————— = child’s dose 
            Age in years + 12

Question 4

To find weight of medication using BSA

Body Surface Area

Answer 4

BSA
——— X adult dose = weight of drug
1.7

Question 5

How to find the BSA (Body Surface Area)

Answer 5

Body Surface Area (BSA)
Calculate weight in kilograms: 210 pounds ÷ 2.2 = 95.45 kg.
Calculate height in centimeters: 6 feet, 3 inches = 75 inches x 2.54 cm/inch = 190.5 cm.
Multiply height by weight and divide by 3600. (190.5 cm x 95.45 kg) ÷ 3600 = 5.
Take the square root of 5 = 2.24 m2