Hematology Calculationscontinued Hematology Review 339
FORMULA EXAMPLE CALCULATION
Retic production index (RPI) =
MCV =
MCH =
MCHC =
HGB (g/dL) 10
RBC (10 /L)^12
¥
HGB (g/dL) 100
HCT (%)
¥
HCT (%) 10
RBC (10^12 /L)
¥
corrected retic count
maturation time correctionffactor*
What is the RPI if the corrected retic is 5% & the HCT is 35%? (maturation time cor-
rection factor for HCT of 35% is 1.5)?
RPI = = 3.3%
Calculate the MCV if the RBC is 3 ¥ 1012 /L, the HGB is 6 g/dL, & the HCT is 20%.
MCV = = 66.7 fL
Calculate the MCH if the RBC is 3 ¥ 1012 /L, the HGB is 6 gm/dL, & the HCT is 20%.
MCH = = 20 pg.
Calculate the MCHC if the RBC is 3 ¥ 1012 /L, the HGB is 6 g/dL, & the HCT is 20%.
MCHC = = 30%
6 10
3
¥
6 ¥ 100
20
20 ¥ 10
3
5
1.5
continued...
*The maturation time correction factor is based on the patient’s HCT & is obtained from a maturation timetable.