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Problem Probable Cause and Solutions
Proficiency test
results are not
as expected
System requires cleaning or maintenance, or reagents or
controls are outdated, deteriorated, or incorrectly handled.
1. Perform all required maintenance and cleaning.
2. Ensure that reagents, controls, and unknown samples
are prepared, handled, and stored correctly.
3. Check all quality control results.
4. Check any unusual occurrences such as error flags or
irreproducible results.
5. Check reagent and instrument reporting categories for
transcription or setup errors.
6. Verify that the controls are not outdated or
deteriorated. Use controls only within their expiration
date.
7. Verify that the reagents are not outdated.
8. Perform a successful two-point calibration.
9. Check for sample movement during measurement.
10. Check the fluid in the sample path for bubbles.
11. Perform a wash.
12. Ensure that sensors are filled with the appropriate
solutions and are free of bubbles.
13. Verify that the sample pump is operating correctly and
test the sample pump flow rate as described in Pump
Functions Test, page 4-58.