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testing question
Apr 23, 2011

I had unprotected vaginal sex without ejaculation about 7 months. I went for hiv testing along with other test because of some swollen lymph nodes. My friend told me he tested negative in January, after our encounter. The doctor told me everything is fine and the test was negative. Today I received A bill stating I had a confirmation test done tthat is a western blot after positive elisa. I'm waiting to hear back from my doctor and I fear the worst that she read my results wrong. My question is, if I had a positive elisa would I have to go and have an additional test for western blot or is it done with the same sample?

Response from Dr. Frascino

Hi,

A confirmatory Western Blot (WB) could have been run on the same sample. We call these ELISA with reflex WB tests. That means if, and only if the ELISA is reactive (positive), a confirmatory WB will be run. A reactive (positive) ELISA with a nonreactive (negative) WB is considered a negative HIV test.

Dr. Bob



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