Siemens ADVIA 2120, Operator'S Manual, Page: 152 / 477

6-34 Flags
Corrective Action
1. Flush the RBC/Baso/Retic flowcell
2. Perform the sheath reagent check.
3. Remove and clean the RBC/Baso/Retic
flowcell.
4. Replace the laser diode.
No Perox NRBC / Lymph Valley (NRPXNV, NV)
The No Perox NRBC / Lymph Valley flag is triggered if there is no valley
between the nRBC and lymphocyte populations when the system reports an
NRBC count.
Results Flagged
#NRBC, %NRBC, WBC, %NEUT, #NEUT, %LYMPH, #LYMPH, %MONO,
#MONO, %EOS, #EOS, %BASO, #BASO, %LUC, #LUC
The green circles in both the NRBC Enumeration histogram and Noise-lymph
histogram below show no valley separating lymphocyte events from the nRBC
population. The red arrow identifies the nRBC events.
NRBC Enumeration Histogram Noise-Lymph Histogram
Perox Irregular Flow Rate (PXIFR, XR)
Definition
The Perox Irregular Flow rate flag is triggered if the cell counting rate is erratic
because of a hydraulic disturbance in the perox channel.
Perox flow rate is evaluated in terms of the cell counting rate:
Flow Uniformity =
Sum of the Squared Differences
9 x Mean Cell Counting Rate
The flag is triggered if this value is greater than 3.2.