CHAPTER 11 Technical Information
Sysmex XE-5000 Instructions for Use 11-27
Revised April 2007
RDW-CV
With points L1 and L2 found at a frequency of 68.26% of the
total distribution area, RDW-CV is calculated from the
following equation:
PLT particle size distribution
Platelet particle size distributions are analyzed using three
discriminators: a lower discriminator (LD) and upper
discriminator (UD), which are automatically set up between
2 – 6 fL and 12 – 30 fL, respectively; and a fixed discriminator,
which is set at 12 fL.
PLT particle size distributions are checked for abnormalities,
including abnormal relative frequencies at the lower
discriminator, abnormal distribution widths and the existence
of more than one peak.
PDW (PLT Distribution Width)
With the peak height assumed to be 100%, the distribution
width at the 20% frequency level is PDW.
Units are expressed in fL (femtoliters), with 1 fL equal to 10
-15
L.
P-LCR (Platelet Large Cell Ratio)
The P-LCR is the ratio of large platelets from the 12 fL
discriminator or larger. It is calculated as a ratio comparing
the number of particles between the fixed discriminator and
UD, to the number of particles between LD and UD.
MPV (Mean Platelet Volume)
The MPV is calculated from the following equation:
PCT: PCT is called the platelet hematocrit or platelet volume
ratio, and is weighted toward the PLT frequency.
(L2)(L1)
68.26% of total
distribution area
L2 – L1
RDW–CV (%) = ✕ 100
L2 + L1
100%
20%
P-LCR
PDW
(LD) (UD)(12 fL)
PCT (%)
MPV (fL) = ✕ 10000
PLT (✕ 10
3
/µL)
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