Baso Noise (B-No, Nb) - Siemens ADVIA 2120 Operator's Manual

Baso Noise (B-NO, NB)

Definition
The Baso Noise flag is triggered if the events counted in the Noise area of the
Baso cytogram are more than 10% of the baso signals.
The B-NO (NB) flag may cause a substitution of the WBC count.
The following rules determine if the WBCB or WBCP count is reported for a
CBC/Diff sample:
•
WBCB is the primary WBC count.
•
If B-NO or B-SAT flags are triggered, the WBCP count is reported if valid.
•
If a B-NO flag and a PX-NO or PX-SAT flag are triggered, the WBCB count
is reported with a sample/system flag.
•
WBCB is reported as the WBC count for samples with a WBC lower than
1.0 x 10³ / μL.
The Noise area (1) of the Baso cytogram is determined by cluster analysis.
If histogram analysis is applied, the Noise area (2) is located between channels 0
and 8 on the y axis.
Results Flagged
WBC, WBCB, %BASO, #BASO
Corrective Action
Multiple occurrences of this flag, especially for consecutive samples, can indicate
a system problem. However, isolated instances of this flag are usually sample
related.
The following list of sample-related causes may not contain all conditions that
could cause this flag. There is no intention to associate the flag with specific
diagnoses.
Flags
Cluster Analysis
1 noise cluster
Histogram Analysis
2 noise area
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