AP BIOLOGY

THE HUMAN IMMUNE SYSTEM

AIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
NORMALLY, HOW LONG SHOULD YOU WAIT TO GET AN HIV TEST TO GET AN ACCURATE READING? (window period)
A
AT LEAST 1-3 MONTHS AFTER INCIDENT
B
AT LEAST ONE WEEK AFTER INCIDENT
C
AT LEAST 1-3 WEEKS AFTER INCIDENT
Explanation: 

Detailed explanation-1: -Antibody tests can usually detect HIV 23 to 90 days after exposure. Most rapid tests and self-tests are antibody tests. A rapid antigen/antibody test done with blood from a finger stick can usually detect HIV 18 to 90 days after exposure.

Detailed explanation-2: -HIV tests after the 3 month window are more than 99.97% accurate. They work for all types and subtypes of HIV. Very few medical tests have 100% accuracy. There will still be rare cases where someone is HIV positive and not picked up.

Detailed explanation-3: -Antigen/Antibody Test-An antigen/antibody test performed by a laboratory on blood from a vein can usually detect HIV infection 18 to 45 days after exposure. Antigen/antibody tests done with blood from a finger prick take longer to detect HIV (18 to 90 days after an exposure).

Detailed explanation-4: -You may need to repeat the test more than 3 months after your possible exposure if your results are negative. A positive result means that HIV antibodies were found and that you may have HIV.

Detailed explanation-5: -How long do I need to wait before I test? There’s a window period between exposure to HIV and a positive test because it takes time for your body to either build a response to the infection or for the virus to replicate enough for a test to detect it.

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