Hemoglobin method comparison
Hello,
I wonder if I can get some help on CAP's instrument comparison requirement. Specifically how you determine acceptance criteria.
We are trying to compare Seimens Rapidpoint, Gem OPL, Avoximeter 1000E, Gem 5000, ABL 800, and a DxH 900 (main lab analyzer). We can't get them to all agree within 7%.
Thanks so much for your help!
Danielle
COM.04250 Comparability of Instruments and Methods - Nonwaived Testing Phase II
If the laboratory uses more than one nonwaived instrument/method to test for a given analyte, the instruments and methods are checked against each other at least twice a year for comparability of results.
NOTE: This requirement applies to tests performed on the same or different instrument makes/ models or by different methods. The purpose of the requirement is to evaluate the relationship between test results using different methodologies, instruments, or testing sites. This comparison is required only for nonwaived instruments/methods accredited under a single CAP number. The laboratory must establish a written procedure for this check that includes acceptance criteria. This requirement is not applicable to calculated parameters.
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Hi Danielle,
CAP fallows CLEA guide lines which is 7%. I have multiple instruments for CO-OX correlations too. The best way to perform them is to use venous blood and correlate them to the D+H 900 separately as a two instrument correlation. It has issues reaching 7% due to the amount of time the blood sits around. I hope this is helpful!
Mary
That's very helpful. I was wondering if we were trying to compare too many instruments at the same time. Thank you!
Your welcome anytime!