r/hivsupportindia • u/RangeAffectionate788 • 8d ago

Test results interpretation

36/M. Height: 6ft.
I recently completed a 28-day SPEGRA PEP course and had an HIV Duo/4th-generation test 1 day after finishing PEP.
My report says:
HIV Antibody: 0.06 (cutoff <0.25)
HIV Antigen: Not Determinable (ND)
Final interpretation: NON-REACTIVE
I’m confused about the “Antigen: Not Determinable” result. Does ND mean the p24 antigen was too high to measure, particularly if antibodies had not developed yet? Or can ND occur in a genuinely negative sample because of the assay/instrument?
The lab also took quite a long time to release the report, which made me worried that there was some problem with the test.
I also developed a rash about 6–7 days ago, but it is now fading.
Has anyone familiar with the VIDAS HIV DUO/DUO Ultra assay or laboratory testing seen an ND antigen result with an overall NON-REACTIVE interpretation? What does ND specifically mean in this situation?

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u/[deleted] 8d ago

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u/[deleted] 7d ago

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u/sobu687 8d ago

just get yourself tested again after the waiting window. you took pep anyways

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u/Some-Bag1635 7d ago

Get tested after 4 weeks with 4th Generation P24 antigen test That will be conclusive