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False Negative NAT At 18 Weeks

Here's a taste of what TheBody.com has to offer on this topic:
Ask the Experts

will antibiotics taken 1 week before the Elisa give false negative

Iam a 30 yr old male , I had a exposure to a girlfriend of mine on the 14th of April 99, and I took the ELISA and the rapid test on the 14 of December 99, and I was negative, but I took again on the 14 January 2000 as I was not sure whether the test...
Judith Feinberg, M.D.

Response from Judith Feinberg, M.D.

University of Cincinnati, College of Medicine
Antibiotics will not interfere with an HIV blood test. Read more »

Guess what? 12 week neg. ELISA is false!! Please read.

Dear Dr Bob,I have written to you in this forum recently to discuss a sketchy situation I got... Read more »

Platelet Donor + False Positive Test

I am a platelet donor and I recently (Jan. 19) received a tetanus vaccine. I donated last week and... Read more »
Articles
San Francisco AIDS Foundation

HIV Testing

...hours, but most test sites send samples to outside labs, where they are tested in batches, so you may have to wait one to two weeks for results. Beyond the Window Period ELISA tests are very rarely "false negative." This means if you have a... Read more »
AIDS InfoNet

HIV Testing

...arrange for HIV testing at any Public Health office, or at your doctor's office. Test results are usually available within two weeks. In the US, call the National AIDS Hotline, (800) 342-2437. The most common HIV test is a blood test. Newer tests... Read more »
The Well Project

What Is HIV?

...HIV? Most people cannot tell that they have been exposed or infected. Symptoms of HIV infection may show up within two to four weeks of exposure to HIV, and can include fever, swollen glands, muscle aches, or rash. Some people do not notice the... Read more »
AIDS InfoNet

Couples With Mixed HIV Status

...activity during any infection: a sexually transmitted disease, or even a cold or flu. Avoid sexual activity within a couple of weeks after getting any vaccinations. If You Are Exposed to HIV ... If a condom breaks, or if you forget to... Read more »
Connect With Others

so ELISA tests NEVER give a false negative?

Posted by Anonymous, 3 Replies
Is this statement correct? Read more »

PCR test negative at 6 wks? Can I stop worrying?

Posted by Anonymous, 2 Replies
...I took a antibody and PCR test at 42 days (6 weeks). Both came back negative. Is it okay to stop worrying and get on with my life??? The test was expensive, but if it means I don't Read more »

why false negative ??

Posted by Anonymous, 1 Reply
...wrote that PCR tests can be false negative, within the window period. Does anyone know why it is so. I had a negative PCR on 7th week. I know this is not a recommended test for the possibilty of false positives. But I didnt have a false positive. Read more »

to jackie re false negatives

Posted by Anonymous, 1 Reply
...false negatives prior to the 8 week positive. Are there a lot of false negatives during ARS? How about false negatives 2 or 3 weeks after "symptoms" suggesting ARS? Is this common? Do the current test pick up the antibodies which are... Read more »