ST-200 aQua Operator’s Manual
ACCURACY
1. Calibrate the analyzer.
2. Using the quality control kit, test each control level three times and
record the data. Repeat this sequence for a total of 3 days.
3. Refer to the published ranges in the “Expected Value Chart”.
4. The mean value (each day) for each parameter should fall within the
published ranges.
PRECISION
1 Collect 5 patient samples.
2 Analyze each sample 10 times consecutively on the ST-200 aQua
and record the data.
3 Calculate the mean, standard deviation and C.V. for each sample.
4 Compare the C.V. for sodium, potassium and chloride and the S.D.
to specifications.
CORRELATION
Use the ST-200 aQua and a reference analyzer (ISE, flame photometer
or other) in the laboratory.
1 Collect 20 patient samples (serum or plasma is preferable for
Na/K/iCa/Cl/Li/pH) and split in half.
2 Measure each sample on the ST-200 aQua and the reference
analyzer.
3 Calculate the difference (Reference analyzer value ST-200 aQua
value) for each sample and record.
4 The laboratory director should determine acceptability.
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