Understanding the System Principles
3-10
expresses the result in fL.
This analyzer calculates the HCT (%), MCH (pg) and MCHC (g/L) as follows:
Where the RBC is expressed in 10
12
/L, MCV in fL and HGB in g/L.
RDW-CV
Based on the RBC histogram, this analyzer calculates the CV (Coefficient of Variation) of the
erythrocyte distribution width.
RDW-SD
RDW-SD (RBC Distribution Width – Standard Deviation, fL) is set on the 20% frequency level
with the peak taken as 100%, as Figure 3-5 shows.
Figure 3-5 RBC Distribution Width – Standard Deviation
RBC Histogram
Besides the parameters mentioned above, this analyzer also presents an RBC histogram,
whose x-coordinate represents the cell volume（fL）and y-coordinate represents the number
of the cells. The histogram is presented in the Analysis Result area of the “Count” screen
when the analysis is done. You can also review the histograms of the stored patient results
(see Chapter 7 Reviewing Sample Results).
The two discriminators of the RBC histogram can be adjusted in case you are not satisfied
with the result. Note that you cannot adjust them if the RBC result is less than 0.2 or out of the
operating range.
10
MCVRBC
HCT
=
RBC
HGB
MCH =
100
HCT
HGB
MCHC ×=
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