Abaxis VetScan HM5 - Measured and Calculated Values

B-8 Operating Principles
B.5 Measured and Calculated Values
The VetScan HM5 measures and calculates the following values from tested blood samples.
Table B-1: Measured and Calculated Values
Values Definitions
White Blood Cells — WBC
(reportable as: cells/l, cells/µl)
Total number of leukocytes (white blood cells).
Red Blood Cells — RBC
(reportable as: cells/l, cells/µl)
Total number of erythrocytes (red blood cells).
Hemoglobin concentration — HGB
(reportable as: g/dl, g/l, mmol/l)
Measured photometrically at 540 nm (see “Volumetric
Impedance Method” on page B-2 for details).
•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
(reportable as: percentage, absolute)
Also known as Packed Cell Volume (PCV).
Calculated from the RBC and MCV values:
• HCT
percentage
= RBC x MCV / 10
• HCT
absolute
= HCT
percentage
/ 100
Mean Corpuscular Hemoglobin —
MCH (reportable as: picogram, fmol)
Average hemoglobin content of erythrocytes, calculated
from RBC and HGB values:
• MCH = HGB / RBC
Mean Corpuscular Hemoglobin Concen-
tration — MCHC (reportable as: g/dl,
g/l, mmol/l)
Calculated from the HGB and HCT values:
• MCHC = HGB / HCT
absolute
Red Cell Distribution Width —
(reportable as: RDW-SD [fl],
RDW-CV [absolute])
Measure of the degree of RBC anisocytosis. Calculated
using the distribution width of the erythrocyte or platelet
population derived from the histogram at 20% of peak:
Platelet — PLT
(reportable as: cells/l, cells/µl)
Number of thrombocytes (platelets).
•PLT = PLT
cal
x (cells/l, cells/µl)
Mean Platelet Volume — MPV (fl)
Average volume of individual platelets derived from the
PLT histogram.
Platelet Distribution Width —
(reportable as: PDW-SD [fl],
PDW-CV [absolute])
Measure of the degree of platelet anisocytosis.
Platelet Hematocrit (Thrombocrit) —
PCT (reportable as: percentage,
absolute)
Calculated from the PLT and MPV values:
•PCT
percentage
= PLT x MPV / 10
•PCT
absolute
= PCT
percentage
/ 100