BB: FORMULAS

Question 1

Volume of blood to be drawn

Answer 1

(Donor’s weight / Ideal weight) x 450 mL

Ideal weight: 110 lbs or 50 kg

Question 2

Volume of anticoagulant needed

Answer 2

Vol. of blood to be drawn / 100 x 14

Question 3

Volume of anticoagulant to be removed from the blood bag

Answer 3

63 - Volume of anticoagulant needed

Question 4

Corrected platelet count increment

Answer 4

Absolute platelet increment/uL x body surface area (m2)/ Number of platelets transfused (1011)

Question 5

No. of cryoprecipitate bags

Answer 5

no. of cryo bags = desired level of F8 x volume of plasma / 80

Question 6

Volume of FMH

Answer 6

Vol of FMH = % of fetal cells x 50

Question 7

No. of RhIg vials

Answer 7

No. of RhIg vials = vol. of FMH/mL / 30

Question 8

UNITS OF FACTOR VIII REQUIRED

Answer 8

(Desired factor VIII level in units/mL – initial factor VIII level in units/mL) x plasma volume (mL)