Bayer HealthCare ADVIA 60, Руководство оператора

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4. TECHNOLOGY
Page 4/5 075D0002-01
4.2.2. Distribution of Red Blood Cells
The study of the distribution of RBC detects erythrocyte anomalies linked to anisocytosis.
A Red Cell Distribution Width (RDW) will enable you to follow the evolution of the width of the
curve in relation to the cell number and average volume.
K SD With K = System constant
RDW = —— SD = Determined standard deviation according
MCV to statistical studies on cell distribution.
MCV = Mean Corpuscular Volume of erythrocytes
4.2.3. Platelet distribution
The platelet distribution study counts platelets, detects platelet anomalies and alerts the lab
operator in the event of a non-platelet cell population (schistocytes, microcytes, etc...).
1 - Platelets are counted, between a low threshold
placed at 2 fL and a variable high threshold. The varia-
ble high threshold varies according to the microcyte
population, which is present in the platelet analysis
zone.
Diag. 4.4
1 Small Cells (SCL)
2 Schistocytes (SCH)
3 Microcytes (MIC)
Diag. 4.5
2 - Measuring the MPV : The MPV (Mean Platelet Volume) is directly derived from the analysis of
the platelet distribution curve. The MPV is expressed in µm
3
or fL.
3 - Calculating PCT :
PLT (10
3
/mm
3
) x MPV (µm
3
)
PCT% = ——————————————
10000
4 - Measuring the PDW (Platelet Distribution Width):
This count is derived from the platelet curve.
PDW = Width of the curve between 15% of the number
of platelets starting from 2 fL (S1) and 15% of the
number of platelets beginning with the variable top
threshold (S2).
1 PDW