Lab Math

Question 1

addition and subtraction of scientific notation

Answer 1

all numbers converted to same power of 10, digit terms added or subtracted

Question 2

multiplication of scientific notation

Answer 2

digit terms multiplied in normal way, exponents added. end result changed so that there is only one nonzero digit to the left of the decimal

Question 3

average adult blood volume

Answer 3

5 qt or 4.75 L

Question 4

adult calculated total blood volume (mL)

Answer 4

body weight (kg) x 70 (ml/kg)

Question 5

neonate calculated blood volume

Answer 5

body weight (kg) x 85 (ml/kg)

Question 6

premature infant calculated blood volume

Answer 6

body weight (kg) x 100 (ml/kg)

Question 7

plasma volume calculation

Answer 7

total blood volume (mL) x (1-Hct)

Question 8

RBC increment in non-bleeding adult

Answer 8

1 g/dl Hgb

3% Hct

Question 9

platelet concentrate increment increase

Answer 9

5000-10000/uL

Question 10

plateletpheresis increment increase

Answer 10

30,000-60,000/uL

Question 11

packed cell increment increase in non-bleeding infant

Answer 11

10 cc/kg body weight increase Hgb 3 g/dl

Question 12

simple dilution formula

Answer 12

sample volume / total volume

Question 13

undiluted serum value

Answer 13

1

Question 14

dilution conversion formula

Answer 14

initial dilution/initial volume = final dilution/final volume

Question 15

concentration conversion formula

Answer 15

V1C1 = V2C2

Question 16

dilution factor if using undiluted patient serum

Answer 16

1

Question 17

concentration when starting with concentrated solution

Answer 17

100%

Question 18

2 units of FFP increase clotting factor activity by what percent?

Answer 18

15-20%

Question 19

corrected count increment formula

Answer 19

(plt count post - plt count pre) x body surface area / # of units plt concentrates infused

Question 20

factor activity formula

Answer 20

units of factor required = (desired factor level (units/ml) - initial factor level) x plasma volume

Question 21

1 unit of cryo per 10 kg body weight raises plasma fibrinogen concentration by?

Answer 21

~50 mg/dl

Question 22

cryo requirement formula - fibrinogen

Answer 22

bags of cryo required = fibrinogen required (mg) x 1 bag cryo/150 mg fibrinogen