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Hi. Can I get HIV from receiving oral sex with a sex worker? HIV and other STIs I got tested for after four weeks were negative. They told me I had an early HIV test and standard test and the results are 98% accurate. What is risk for me now? I am not on any medication and have good health, so can my results change after three month or do I need to get test again


We do not consider receiving oral sex as a risk for HIV. Therefore, you should not have to repeat the HIV test for the oral sex you got 4 weeks ago.

However, it is possible to get other STIs when you receive oral sex. These include Chlamydia, gonorrhea, HPV, herpes and syphilis. 

Your urine tests done at 4 weeks should have been accurate for gonorrhea, because most results are accurate after 7 days.  The test for Chlamydia is most likely accurate at 4 weeks, but it can take up to 6 weeks to show up.

The blood test for syphilis, done at 4 weeks, may be a bit early. Most tests will become positive within 6 weeks, but it can take as long as 3 months to show up.

As for HPV and herpes, we usually diagnose them when we see signs of them.  Check out our pages on herpes and HPV.

You might find it helpful to look at our "STI at a Glance" chart. It gives information on window periods and you can see when tests will be most accurate. 

You may want to repeat some tests, such as Chlamydia and syphilis, 6 weeks to 3 months after the contact you had. 

Please leave a comment to let us know if that answers your question or if you need more information.

Health Nurse

This answer was posted on October 9, 2012

Community comments

Kuli says:

In general, receiving oral sex( insertive) is a non-risk issue. However, what if the person who performed oral got a little of blood in her mouth due to bleeding gum, biting on the lips or some thing like that?

Health Nurse says:

The presence of blood does increase the chances, but even with a small amount of blood HIV is not commonly or easily passed this way.

For more info on the chances of getting an STI based on the way you have sex, check out our "Know Your Chances" charts:

Health Nurse says:

Question submitted: Hi I had an unprotected oral sex on the 22nd of November in a massage center back in India , although I was drunk due to which i was unaware that the lady is about to give a blow job ,this was for two minutes i asked her to stop and i stepped out had a shower , since then I was so anxious thinking about STDs and HIV I had my HIV (tridot)card test ,VDRL which was followed by TPHA and HIV1/2 Ab +P24 Ag on the fifth week of exposure (from Dubai) all were negative , non reactive and negative accordingly Still i am confused to make a conclusion as i read in many journals ,that the confirmation can be done only after 12 weeks for syphilis and HIV Please help me for further advise

Health Nurse says:

Hi, we don’t see HIV passing when receiving oral sex; STI like syphilis, gonorrhea, chlamydia etc... Can be passed when receiving oral sex. The HIV test we use in Canada is 95% accurate by 6 weeks and would give you a final result at 3 months. Syphilis is similar to HIV in that most blood tests would show a positive result by 6 weeks but in some situations can take up to 3 months. Most gonorrhea and chlamydia would show up by 2 weeks.

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