PN 177196BB
7-31
DATA MANAGEMENT AND REVIEW
DATA ANALYSIS REVIEW - PLATELET PARAMETERS
7
b. Microcytic red cells can intrude at the upper end of the histogram.
1) If specimen contains microcytes, the Analyzer may be able to successfully
eliminate the influence of this interference by repositioning the variable
threshold (25 fL threshold) and excluding the microcytes.
2) Three possible scenarios showing intrusion on the upper end of the platelet
distribution are on the following page.
Pct Calculation
1. Pct (plateletcrit or thrombocrit) is calculated according to the formula:
2. Pct parameter result is displayed and printed as a percentage (%).
3. No clinical significance has been identified for Pct parameter.
4. Pct (and PDW) are not FDA approved parameters; therefore, these parameter labels and
results are not routinely displayed in the United States, but may be routinely displayed in
other countries.
Summary
1. Table 7.8 summarizes the RBC parameters generated by the A
C
•T 5diff instrument and
how each is derived.
2. For details on the methodologies used, review
Heading 2.2 MEASUREMENT PRINCIPLES and
Heading 2.7 PARAMETER DEVELOPMENT, in the Online Help System or the Instructions for
Use manual
.
3. For details on the flags and interpretive messages for that can be generated, review
Heading 9.8 FLAGS AND MESSAGES GENERATED BY THE INSTRUMENT, in the Online Help
System or the Instructions for Use manual
.
23
Plt 10
3
/µL()MPV (fL)×
10 000,
---------------------------------------------------------------
Pct%=
Table 7.8 Platelet Parameter Summary
Category Parameter Source of Data
Directly Measured Plt (Platelet Count) Coulter Principle
Derived from the PLT Histogram MPV (Mean Platelet Volume) Histogram developed using Coulter Principle
PDW (Platelet Distribution Width) Histogram developed using Coulter Principle
Computed Pct (Plateletcrit)
Plt count MPV×
10
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