Coox Comparisons between Multiple GEMs

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For sites that have multiple GEM blood gas analyzers, what do you use for comparing methhemoglobin, carboxyhemoglobin, oxy and deoxyhemoglobin across the instruments?
Thanks in advance for your replies!

4 Replies

Karen Clark

Wed Sep 27, 2023 at 7:35AM

Lois- we have 5 GEM 5000'S. We run 5 patient samples and compare it to a GEM that has been designated as the reference. We use the CAP allowable limits for acceptability.

Lois Schultz

Wed Sep 27, 2023 at 8:14AM

Thanks Karen! I have 24 GEMs and am looking for something that would be stable enough to run on all instruments across a couple of days. I use PVP for all the other analytes but am looking for something that includes the HGB fractions. CAP has an SO Quality Cross check kit but it only contains 3 vials. I may also look at using RNA Medical CVC kit.

Sonia Guzman

Wed Sep 27, 2023 at 8:21AM

Our institution has 12 GEM4000 analyzers. We use the manufacturer system evaluators level 1, 2, 3. We also use the CAP TEA (Total allowable error) and compare to 2019: CLIA proposed changes to PT acceptable limits - Westgard our director likes to always have a tighter TEA. Hope this helps.

Ken Charpie

Thu Dec 21, 2023 at 6:34PM

More recent link for the newest acceptable PT limits for 2024 (westgaard site):
2024 CLIA Proposed Acceptance Limits for Proficiency Testing - Westgard

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Coox Comparisons between Multiple GEMs