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Is 4th Generation HIV Test Done 41 Days After Exposure Conclusive?

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Posted on Tue, 12 Jan 2016
Question: Hi Doctor.Incident on November 11 2015 with condom broke in middle immediately I tried take and ejaculate after that.I did test on the girl with oracheck it was negative .Today after 41 days I did 4th generation antigen/antibody test and came negative.Also I went ahead and did pcr test waiting for results what will be the out come the test same as rapid 4th generation ? Curious and worried .Please provide some insights and help for conclusion.correction I did the test on her with OraCheck after 4 weeks it came negative. After 41 days my rapid 4th generation was negative , I read the pcr will give results faster and less window period so I don't need to test again.
doctor
Answered by Dr. Dr. Michelle Gibson (44 minutes later)
Brief Answer:
window period is 2 to 4 weeks, so your result would be accurate after month

Detailed Answer:
HI, thanks for using healthcare magic

The window period for the 4th generation HIV tests is approximately 2 to 4 weeks after exposure.
These tests check for HIV antibodies (formed when the body reacts to HIV virus) and also check for p24 antigen (a protein associated with the virus itself).

The p24 can be picked up approximately 2 weeks after exposure (in some cases, a few days before).
This is why this test, since it checks for both the p24 and the HIV antibodies, has such as short window period.

This means that since you checked at one month, your result would be accurate and you are HIV NEGATIVE.
You do not need to test again

I hope this helps, feel free to ask any other questions
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Dr. Michelle Gibson (11 minutes later)
Thanks for the reply doctor. What about the PCR tests I had today should come negative as well correct please advise? So I don't need to confirm the results after 3 month window period?
doctor
Answered by Dr. Dr. Michelle Gibson (2 hours later)
Brief Answer:
no need for 3 month tests

Detailed Answer:
HI

No, there is no need to do any additional testing at 3 months.

That would be done if you had done a test with a 3 month window period, if this was the case, the test should be repeated at 3 months

The PCR test has a window period of 2 to 3 weeks so this would give you an accurate result by this time

If anything else unclear, feel free to ask to ask
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Dr. Michelle Gibson (42 minutes later)
P24 was done after 41 days today came negative do you think I need to repeat again in 3 months ? .And now pcr waiting for results they told it will be 100 accurate and no give testing required after the test
doctor
Answered by Dr. Dr. Michelle Gibson (8 hours later)
Brief Answer:
no, does not need repeating

Detailed Answer:
No

the window period for this particular test is up to 4 weeks. This means that at 41 days, it would give an accurate result. This result is a true picture of your HIV status. It does not need repeating

There are other tests that have a longer window period that would need repeating at 3 months but not this test.

Hope this reassures you, if there are any other queries, can let me know
Note: Get personalized answers to your HIV related queries You can choose to talk face to face with your doctor. Book a Video Call now.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Dr. Michelle Gibson

General & Family Physician

Practicing since :2001

Answered : 16845 Questions

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Is 4th Generation HIV Test Done 41 Days After Exposure Conclusive?

Brief Answer: window period is 2 to 4 weeks, so your result would be accurate after month Detailed Answer: HI, thanks for using healthcare magic The window period for the 4th generation HIV tests is approximately 2 to 4 weeks after exposure. These tests check for HIV antibodies (formed when the body reacts to HIV virus) and also check for p24 antigen (a protein associated with the virus itself). The p24 can be picked up approximately 2 weeks after exposure (in some cases, a few days before). This is why this test, since it checks for both the p24 and the HIV antibodies, has such as short window period. This means that since you checked at one month, your result would be accurate and you are HIV NEGATIVE. You do not need to test again I hope this helps, feel free to ask any other questions