|mantoux test false positive readings
Sep 1, 2000
Last year I got a mantoux test which showed a positive reading withing 30 minutes. Subsequent x ray showed nothing. I was born in Hong kong and was given TB vaccine and advised to ignore the positive. This year the same test showed the same result (swelling size of a quarter within 30 minutes) I am reluctant to take drugs in the event that this is a false positive. Is a false positive due to the vaccine or sensitivity to the test likely. I do not have HIV and am healthy. Picked up this site on a search for the Mantoux test. Your input still appreciated. Thanks
| Response from Dr. Pavia
I will answer this since many people with HIV/AIDS have questions about the TB skin test (aka mantoux or PPD). The test is read by measuring the amount of swelling under the skin at 48-72 hours. An immediate reaction does not mean anything, and may be a reaction to the injection itself.
The BCG vaccine is given during childhood. It does NOT routinely cause false positive tests in adults, a common myth. For a few years after vaccination, positives can occur, but they are usually small reaction, often of less than 10 mm.
If anyone is reading your test at 30 minutes and not at 48 to 72 hours, they are confused. Make sure things are clarified
Andrew T. Pavia, M.D.
Get Email Notifications When This Forum Updates or Subscribe With RSS
- What Can Cause A False Hpv Reading?
- Blood In Urine After Anal Sex Bottom Worried I Have HIV
- Burning Urethra After Having Sex During Period Worried I Have HIV
- Dizziness After Receiving Oral Sex Worried I Have HIV
- Flu Symptoms After Giving Handjob Worried I Have HIV
- Vaginal Discharge After Licking Anus Worried I Have HIV
This forum is designed for educational purposes only, and experts are not rendering medical, mental health, legal or other professional advice or services. If you have or suspect you may have a medical, mental health, legal or other problem that requires advice, consult your own caregiver, attorney or other qualified professional.
Experts appearing on this page are independent and are solely responsible for editing and fact-checking their material. Neither TheBody.com nor any advertiser is the publisher or speaker of posted visitors' questions or the experts' material.