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20.4 Specifications
20.4.1 Measured Parameters
White Blood Cells – WBC
(cells/l, cells/µl)
Number of leukocytes
WBC = WBC cal x (cells/l, cells/µl)
Red Blood Cells – RBC
(cells/l, cells/µl)
Number of erythrocytes
RBC = RBC cal x (cells/l, cells/µl)
Hemoglobin concentration - HGB
(g/dl, g/l, mmol/l)
Measured photometrically at 540 nm; in each cycle
blank measurement is performed on diluent
HGB = HGB cal x (HGB measured – HGB blank)
Mean Corpuscular Volume - MCV
(fl)
Average volume of individual erythrocytes derived
from the RBC histogram.
Hematocrit – HCT
(percentage, absolute)
Calculated from the RBC and MCV values.
HCT percentage = RBC x MCV x 100
HCT absolute = RBC x MCV
Mean Corpuscular Hemoglobin –
MCH
(pg, fmol)
Average hemoglobin content of erythrocytes,
calculated from RBC and HGB values.
MCH = HGB / RBC
Mean Corpuscular Hemoglobin
Concentration – MCHC
(g/dl, g/l, mmol/l)
Calculated from the HGB and HCT values.
MCHC = HGB / HCT absolute
Unit of measurement is displayed according to the
one chosen for HGB result (g/dl, g/l or mmol/l)
Red Cell Distribution Width – RDW-
SD (fl)
Platelet Distribution Width – PDW-
SD (fl)
Red cell Distribution Width – RDW-
CV (absolute)
Platelet Distribution Width – PDW-
CV (absolute)
The distribution width of the erythrocyte or platelet
population derived from the histogram at 20% of
peak
x DW-SD = RDW cal x (P2 - P1) (fl),
x DW-CV = RDW cal x 0.56 x (P2 - P1) / (P2 + P1)
by the factor of 0.56 CV is corrected to the 60% cut
Platelet – PLT
(cells/l, cells/µl)
Number of thrombocytes (platelets)
PLT = PLT cal x (cells/l, cells/µl)
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