Baso Temperature Out Of Range (Bto, Tb) - Siemens ADVIA 2120 Operator's Manual

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.
Results Flagged
WBCB
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.
System Related
1. Check baso reagents.
2. Check the pressure and vacuum readings.
3. Check sheath delivery.
4. Check baso hydraulics.
5. Check RBC/Baso/Retic flowcell alignment.

Baso Temperature out of Range (BTO, TB)

Definition
The Baso Temperature Out of Range flag is triggered if the baso reaction
chamber temperature is not between 31.9°C and 34.1°C.
The BTO (TB) flag is not triggered if agreement between the baso and perox
results is indicated by both the following conditions:
•
WBCB and WBCP agree within specified limits (No WBC-CE flag)
•
[(%NEUT + %EOS) - %PMN] is between 0 and 7.5
6-30
Sample Related
•
Leukemia
(high WBC)
•
Fungal infections
•
Cell clumps
Flags