Calculations

Question 1

WBC Specific Gravity

Answer 1

1.06

Question 2

pRBCs Specific Gravity

Answer 2

1.08

Question 3

Plasma Specific Gravity

Answer 3

1.03

Question 4

Weight of unit

Answer 4

Volume x specific gravity

Question 5

Volume of unit

Answer 5

Weight/specific gravity

Question 6

Anticoagulant Removal

Answer 6

63 mL - ((donor’s weight/110 lbs) x 63))

Question 7

Amount of blood to draw

Answer 7

(donor’s weight/110 lbs) x 450 mL

Question 8

One Whole Unit in adult

Answer 8

Hgb increase 1 g/dl
Hct increase by 3-4%

Question 9

Whole Unit in Newborn

Answer 9

Given 20 ml/kg will increase Hgb by 3 g/dl

Question 10

One Unit of pRBCs in adult

Answer 10

Same effect as Whole Blood

Question 11

Unit of pRBCs in newborn

Answer 11

Given 10 ml/kg will raise Hgb by 3 g/dl

Question 12

Percent Recovery of Transfused Blood

Answer 12

100% - (number of days old + days from transfusion)
ex: 10 day old unit, transfused, what is recovery at 14 days?
100% - (10+14) = 76%

Question 13

Rhogam (RhIg) Calculation

Answer 13

(% of fetal cells x 50)/30
Round up or down and add an extra vial

Question 14

Platelet pheresis Unit

Answer 14

Increase patient platelet count by 30-60,000/cumm

Question 15

Cryoprecipitate

Answer 15

Must contain 80 IU of Factor 8
Composed approx of:
50% Factor 8
20-40% fibrinogen
Some Factor 13