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2.2.3. Precision
◆In order to verify the precision of the instrument, it is recommended to run a Fresh, Normal
Whole blood sample (10) times, mixing between each analysis cycle.
◆After all 10 run are complete, calculate the Coefficient of Variation percentage (CV %).
◆Compare the CV % results with those listed (See Section 1,
page 1-10).
If the precision of any parameter is not within these specifications, identify the out-of-range pa-
rameter(s) and initiate appropriate troubleshooting procedures.
Calculation factors for CV% determination
Definitions:
X = the calculated Mean
n = the total number of samples
Xi = the individual parameter value
SD = Standard Deviation
◆Once the CV%s have been calculated, compare them to the specified limits.
2.2.4. Calibration
If the system seems to be operating properly, fresh uncontaminated reagents are being used, and
the precision is within the specifications, the
tion 4,
2. Calibration
, page 4-11)
2.3. Troubleshooting Parameters
The procedures described below should be performed whenever the precision of a parameter is not
within its CV specifications or the parameter is incorrect or suspicious.
When all parameters are affected, it is necessary to look for a common cause e.g.(Vacuum, pres-
sure,sample aspiration, chamber filling and draining correctly, common reagent pollution, etc....).
When only one parameter is affected, it is necessary to look for a cause in this specific area of anal-
ysis. The different tables listed, give the noted problems for the parameter in question, possible
cause of the problem, and the necessary user action to correct the problem.
Maintenance
xi
∑
X
=
--- -
n
∑
2
〈
〉
X Xi
–
SD
=
------------------------------
n 1
–
CV % = (SD x 100)/X
ABX Micros
ABX Micros
& Troubleshooting
Troubleshooting
3.3. Precision
(Repeatability),
60
may need calibration (See Sec-
60
- User Manual - RAB042FEN - 19
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