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Doctor insights on: False Positive Tb Test

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Can weed cause a false positive TB test?

Can weed cause a false positive TB test?

No : Have not heard about that, no relationship., . ...Read more

Dr. Scott Lindquist
585 doctors shared insights

Mycobacterium Tuberculosis Infection (Definition)

Mycobacterium tuberculosis is an infectious organism that spreads by droplets coughed out by an infected person. Infection is established initially in lungs, but can spread within lungs & to other body parts, or can become latent, with reactivation occurring years to decades later. With effective treatment, it can be completely eliminated although drug resistant ...Read more


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Can DPT booster done at the same time affect TB test so that it is interpreted as false positive? In addition, TB test site bled right after injection

Can DPT booster done at the same time affect TB test so that it is interpreted as false positive? In addition, TB test site bled right after injection

PPD: First- DTP injection does not affect the response to TB test second- TB test is placed intra dermally - which means no bleeding at injection site. ...Read more

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Why would someone born in india get a false positive on a PPD TB test?

Why would someone born in india get a false positive on a PPD TB test?

Easy: What determines a false-positive test? Either not measuring induration, or that it was due to prior bcg, which seldom lasts more than 5 yrs. If someone has a negative PPD it means either that they do not have a focus of inactive tuberculosis or that they are anergic (incapable of reacting due to deficiency in immune mechanisms). ...Read more

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Tb test site bled right after injection. Can this give a false positive?Obviously, it was not intradermal. Don't answer if you don't know how to.

Check with your doc: The test was not appropriately administered. You want to ask your doc for a new one. Or get the igra blood test which is better anyway. The skin test is almost in the museum of history of medicine. ...Read more

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What percentage test false-positive for tb?

What percentage test false-positive for tb?

TB skin test isn't: Perfect test.A false-positive test may happen if you've been vaccinated with the bacillus calmette-guerin (bcg) vaccine. This tuberculosis vaccine is seldom used in the United States but is widely used in countries with high TB infection rates. ...Read more

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How accurate is this test :quantiferon-tb gold? And can they show up like false positive?I have test done and don't like the results i see .Scared

QFT Gold : Quantiferon gold can give false negetive or positive. Blood samples must be processed within 12 hours after collection while white blood cells are still viable. Test is not reliable among persons recently exposed to m. Tuberculosis, and in immunocompromised persons. False positive results can occur with m. Szulgai, m. Kansasii, and m.Marinum. ...Read more

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Dr. Klaus D Lessnau
1,183 doctors shared insights

Tuberculosis (Definition)

Is an infection in the body with mycobacterium tuberculosis. It is almost always acquired via the respiratory tract from which it can spread to other organs. After that, the immune system walls the bacteria off. All of this usually occurs without symptoms. After that, activation of the infection can occur in about 10% of the total patients. Half of this risk is in ...Read more