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Hepatitis B
what are causes of false positive Hep BsAg. First screening test for HBsAg was positive.Second screening test after 2 weeks is negative.What are the possibilities.
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False positive is rare., however mistakes are possible: human error, faulty test reagents etc. In your case, you need to repeat your test, preferably at another laboratory.
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If it is due to reagents,will confirmatory test on  the same sample be negative?
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Don't know. I would test again with a fresh draw at another laboratory.
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