6 mo. comparison criteria for iSTAT HCT?
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What criteria does anyone else use for required 6 mo. instrument comparisons (example: i-STAT to main lab) for the HCT test? CAP Proficiency grading criteria are popular to use, but that is comparing to the same instruments peer group. Is that too limited
for comparing to a different instrument/method?
thanks,
Cathy A. Owens, MT(ASCP)
Supervisor, Point of Care Testing | Carilion Roanoke Memorial Hospital
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We use CAP criteria to compare iSTAT to our lab.
We use cap as well
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What criteria does everyone use for method comparison acceptance for istat to your main lab for your chemistry analytes? CAP criteria is too tight when comparing different instruments.
Thanks
Kim
Kim which analyte are you having trouble with? We always use CAP criteria for every analyte and rarely have problems. Specimens have to be fresh, whole blood, preferably from a heparin syringe. Usually if my results don't match it's because my specimen was old, frozen and thawed, etc. I never have issues with fresh.
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I use Data Innovations for my comparisons.
We using patient samples that are collected in a green lithium heparin tube, the samples sometimes are up to 2 hours old due to collecting at one site and then having to travel to another hospital to run. We do run the I-STAT and lab instrument at the same time once we reach our location. Our issue this year has been BUN, using CAP limits we are falling out. CAP states +/-2mg/dL or 9%, an example would be values of 14 and 17. We also have trouble meeting the hgb/hct expectations that are listed in the I-STAT bulletin 716240-00E:
--Average I-STAT hematocrit results over a group of samples should normally agree with those from the comparative method within +/-2%PCV at 29%PCV and below, +/-3%PCV from 30-50 %PCV, and within 10% above 50% PCV
We are looking for reference material like what CAP has produced, but CAP's limits are based on I-STAT to I-STAT values, not I-STAT to another analyzer.
Kim