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By checking for the precision of that instrument. And making a full evaluation on its accuracy, range, quality. The procedure would be much easier if more than one instrument was available to compare results.
We can Evaluate the Instrument according to the Pattern of its results.
we should having range of this instrument and is monthly preventive maintance
Instrument Should be calibrated by calibrators. Quality controls should be with range by external or internal controls.
Internat / external temperature should be proper or required.
verification of accuracy, calibration of the instrument
To evaluate any laboratory instrument, it needs just to monitor the degree of accuracy and precision.
1. each machine should be calibrated, perform the periodic preventive maintenance as recommended by the manufacturer and done by the assigned engineer
2. daily,weekly and monthly maintenance must be performed.
3. we established to perform Method Validation/Verification including:
a. verification of precision
b. verification of accuracy
c. verification of reference range
d. verification of machine Carry over
e. Method Comparison from one machine to another.
By running certified standards and making sure that everything is within acceptable limits.
by make sure that its output has been calibrated with an accredited calibration body.
Read thsi article well help you to answer your question.
http://apps.who.int/medicinedocs/documents/s22409en/s22409en.pdf?ua=1
throughusing the qaulity controls for each test before using any instrument, so through he positive and negative controls we can get an accurate resultfrom any instrument and we can also evaluatethe error value in each test and also the daily maintenance of each instrument keeps the needles and instrumentalducts very clear and equipaid for test using
