A member asked:

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?

A doctor has provided 1 answer
Dr. Bahman Omrani answered

Specializes in Pain Management

HLA B27 Asssay: The pcr method has better sensitivity and specificity than the 1st test, antigen assay. Your symptoms and other clinical findings are more important.

Answered 7/11/2013

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