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A member asked:
Few cases of iritis. had blood tests for hlab27. one was positive, one was negative. neg test was by pcr. is it safe to say that i do not have hlab27?
A doctor has provided 1 answer
Yes: Different antisera have different sensitivities for hla-b27 and the antigen is not always the same molecule in different families anyway. Plus, testing for hla-b27 is only a guide that makes a particular diagnosis (ankylosing spondylitis, psoriatic arthritis) more or less likely in any case. Don't give it another thought.
Answered 10/31/2013
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Few cases of iritis. Had hla-b27 blood test done. One was positive, one was negative (by pcr). Since PCR is most sensitive, does this mean i'm clear?
If blood test by PCR was negative for hla b27, does this mean i definitely don't have it? (one other blood test was positive; not sure of the type).
To hsv2, PCR from ulcer is positive. 2month later the blood test is negative. Which one to believe. Is 2month blood test long enough to reject pcr?
Tested negative for Chlamydia + Gonorrhea (PCR), Syphilis (RPR), HIV (4th gen Combo), HSV (IgG and IgM blood test), Hep B and Hep C 96 days after exposure? Am I safe? Are those tests clinically conclusive every single one of them?
Had 2 blood tests for hla b27. 1st test came back positive; 2nd test (pcr) came back negative. What would be the difference between the two tests?
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