Non-confirming would mean either that when the HBsAg positive donor sample was sent for confirmatory testing, it was not not neutralized (not-confirmed) or the confirmatory test used was not an actual confirmatory test, but possibly a supplemental test. General I would think that non-confirmed means just that, the confirmatory test did not confirm HBV.
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HBsAg confirmatory test
in Donor Services and Donor Recruitment
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Non-confirming would mean either that when the HBsAg positive donor sample was sent for confirmatory testing, it was not not neutralized (not-confirmed) or the confirmatory test used was not an actual confirmatory test, but possibly a supplemental test. General I would think that non-confirmed means just that, the confirmatory test did not confirm HBV.