Reference Ranges

RBC reference interval:

4-6 × 10¹²/L

HgB reference interval:

12-18 g/dL

HCT reference interval:

35-50%

MCV reference interval:

76-100 fL

MCH reference interval:

26-34 pg

MCHC reference interval:

32-36 g/dL

RDW reference interval:

11.5-14.5%

WBC (total) reference interval:

3.6-10.6 × 10⁹/L

PLT reference interval:

150-450 × 10⁹/L

reticulocytes (absolute) reference interval:

20-115 × 10⁹/L

reticulocytes (relative) reference interval:

0.5-2.5%

neutrophils (relative) reference interval:

50-70%

lymphocytes (relative) reference interval:

18-42%

monocytes (relative) reference interval:

2-11%

eosinophils (relative) reference interval:

1-3%

basophils (relative) reference interval:

0-2%

how do you calculate RPI (reticulocyte production index)?

corrected reticulocyte / maturation time

how do you calculate the corrected reticulocyte value for RPI calculations?

(retic % x HCT) / 45

if RPI is ____, the bone marrow is effectively compensating.

>3

if RPI is ____, the bone marrow is ineffectively compensating.

<3

how do you calculate WBC correction for nRBCs?

(WBC count x 100) / (nRBC + 100)

how do you calculate cell counts from a hemacytometer?

(avg cell count x dilution factor) / (area in mm2 × 0.1)

what is the equation for MCV?

(HCT/RBC count) x 10

what is the equation for MCH?

(HgB/RBC count) x 10

what is the equation for MCHC?

(HgB/HCT) x 100

what is the equation for HCT?

(RBC/total volume) x 100

what is the equation for % retics?

(number of retics/1000 RBCs) x 100