How accurate are the 20 minute HIV tests?

Say you go and take this HIV test where you get the result in 20 minutes. It does test your blood cos they prick you finger to draw blood. How accurate is this test at 4 months after a possible exposure?
Answer:
99.6

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it should be very accurate. I wouldnt worry too much

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I'm going to double check this, but off the top of my head I seem to recall an accuracy of about 1/1000. I would feel very confident in the results.

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99% sensitive. This means that they are very accurate.

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