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Doctor insights on: Quantiferon Test For Tuberculosis False Positive

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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

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

Dr. Scott Lindquist
613 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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2 TB skin tests. Bumps measured 15cm. RN stated I possibly have LTBI & ordered QuantiFERON Gold in-tube test. Could anything cause a false positive?

2 TB skin tests. Bumps measured 15cm. RN stated I possibly have LTBI & ordered QuantiFERON Gold in-tube test. Could anything cause a false positive?

Not at 15cm, but...: The bump is more likely 15mm, because 15cm is 6 inches and HUGE. A 15mm bump on a screening test is big but may still be a false positive (a screening test means the patient has NO symptoms of tuberculosis). If a patient has contacted somebody with TB, or has current symptoms, she likely has a true positive unless her bump is due to past BCG vaccine. The Quantiferon-TB blood test is very accurate. ...Read more

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Positive quantiferon gold test but negative xray?

Positive quantiferon gold test but negative xray?

See below: It means that you have been exposed to tb. A chest x-ray that is positive would indicate either past or active infection. ...Read more

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Negative ppd, positve quantiferon, what does this mean?

Negative ppd, positve quantiferon, what does this mean?

+ Gamma Assay: Means you where exposed to Tuberculosis and so may require prophylactic therapy.
The gamma assay is more sensitive and specific for Tuberculosis than the Mantoux test (PPD)! ...Read more

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Ulcerative colitis positive quantiferon gold (ltbi) can I take steroid?

Ulcerative colitis positive quantiferon gold (ltbi) can I take steroid?

Probably not yet: You really need to discuss this with your gi. If it was me, I would start treatment for tuberculosis first and use a uc medication that does not suppress the immune system for a month. Only then would I consider Prednisone or anything that suppresses the immune system. ...Read more

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What is meant by false positive test results?

Not really positive: A false positive test is when the test is really negative but was reported or converted to positive but is not a true indicator for the result. ...Read more

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Are false positive herpes test likely?

Are false positive herpes test likely?

No: A positive antibody means you're infected with herpes. That doesn't mean you're developing outrbreaks, but it does mean that you at least have latent herpes somewhere in your body. A positive culture or pcr for herpes means you have an active lesion. ...Read more

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What will give me a false positive pregnacy test?

What will give me a false positive pregnacy test?

False pregnancy test: Home pregnancy tests are generally speaking quite reliable and accurate. And they are the same test that are used by physicians in an office-based test. False positive test results are exceedingly rare. If you got such a result the best thing to do is either to repeat it or to see a physician and explain what happened. Your doctor may then order a blood test for pregnancy. ...Read more

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Is it possible to have a false positive herpes test?

Is it possible to have a false positive herpes test?

Yes: Always remember never say always or never. Certainly labs can accidentally mishandle a specimen. A culture, if positive, is good evidence of hsv infection, however antibody testing is more difficult to interpret in some situations. ...Read more

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Is it possible to have a false positive on a herpes ab test?

Is it possible to have a false positive on a herpes ab test?

Yes: A positive antibody test does not mean you have herpes. A positive test can mean you were exposed to herpes, but not necessarily infected. ...Read more

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False posotive for drug test what can causr a false positive for THC on an institant drug test

False posotive for drug test what can causr a false positive for THC on an institant drug test

A lot of products.: A screening drug test is not perfect. A site I would recommend for a list of over the counter medications and the associated false positives is: http://www. Askdocweb. Com/falsepositives. Html. ...Read more

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False positive stress test reason?

False positive stress test reason?

Body habitus: Most common cause of false positive stress test is body habitus. This commonly affects women because the heart rhythm needs to be picked up through their breast tissue. ...Read more

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Are false positive HIV tests rare?

Are false positive HIV tests rare?

HIV testing: This depends upon the test employed. They are generally both sensitive and specific but false positive results do occur. This question can be overcome with further testing, the most specific being PCR for HIV RNA. You should be seen by an expert in the management of HIV disease. ...Read more

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Can weed cause a false positive TB test?

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

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Does xenical give a false positive drug test?

Does xenical give a false positive drug test?

No: I know of no research that shows xenical can cause a false-positive drug test. All xenical does is block some of the fat from your diet from being absorbed, thus decreasing your calorie intake. This shouldn't cause either a urine or a blood drug test to become positive. ...Read more

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Can xenical cause a false positive drug test?

Unlikely: Given xenical's mechanism of action - blocking absorption of fat, it is unlikely that the drug itself would be highly absorbed and mimic any substances tested in a drub test. ...Read more

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What could cause a false positive gonorrhea test?

What could cause a false positive gonorrhea test?

Not common: The only thing I can think of would be a mislabeled specimen, a clerical error on the lab report, or a contaminant in the lab. ...Read more

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Does minocycline cause a false positive on the ANA test?

Does minocycline cause a false positive on the ANA test?

The positive is real: If you develop antinuclear antibodies while taking minocycline, you might do well to consider a different medication, especially if your liver enzymes also went a little bit high. ...Read more

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By what mechanism do drugs cause a false positive VDRL test?

By what mechanism do drugs cause a false positive VDRL test?

False positive vdrl: The antibody against the syph treponeme produced by a patient with syphilis reacts with an extract of ox heart (diphosphatidyl glycerol). VDRL therefore detects anti-cardiolipin antibodies (IgG, IgM or IgA), visualized through foaming of the test tube fluid, or "flocculation". False positive results happen thru cross reaction of anocther glycoprotein. Can be from drugs, viruses, lupus, RA, etc. ...Read more

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Can Valtrex (valacyclovir) trigger a false positive herpes test?

Can Valtrex (valacyclovir) trigger a false positive herpes test?

Herpes simplex: Depends upon the test to which you are referring. Valtrex (valacyclovir) may diminish the presence of virus in the skin or mucous membranes lesions and lessen the chances of a viral culture being positive, but will not in any way alter the antibody test on a blood specimen. ...Read more

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Can pseudoephedrine sulfate result in a false positive drug test?

Pseudoephedrine: Yes, to stimulants such as meth, & also to ecstacy. ...Read more

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Can Levetiracetam give me a false positive reading on an ETG test?

Can Levetiracetam give me a false positive reading on an ETG test?

Keppra (levetiracetam): Ethyl Glucuronide alcohol test false positives have been reported with Anti-seizure medications such as Keppra (levetiracetam) & Neurontin. ...Read more

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Can type 1 diabetes cause test results to be false positive constantly?

Can type 1 diabetes cause test results to be false positive constantly?

Not likely: The general answer is no but you'll need to be more specific about your tests of interest. ...Read more

Dr. Klaus d Lessnau
1,212 Doctors shared insights

Tuberculosis (Definition)

A potentially serious infectious bacterial disease that ...Read more