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Doctor insights on: What Does A Tb Test Look Like When It Is Negative

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What does a negative TB test look like?

What does a negative TB test look like?

Doc: Either your blood test igra is negative or your skin testing does not show any "bump". This should always be checked by a professional since even health care workers report false results. Best to check with a doc and not pa or np or nurse. ...Read more

Dr. Scott Lindquist
561 doctors shared insights

Mycobacterium Tuberculosis Infection (Definition)

Mycobacterium tuberculosis infection is also known as Tuberculosis. 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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What do a positive and negative TB test look like?

TB Tests: I bet you could google image that question. A positive reaction is read after 48 hours from the test. It would be a raised redness greater than 5 mm in circumference. ...Read more

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What does a + TB test look like?

What does a + TB test look like?

Positive PPD test: A positive TB test should look like hard, raised bump with size >5to15 mm depending of the risk category you are in. It should be read in between 48 to72 hours. It is the hardness and not redness which is read. Thanks. ...Read more

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What does a positive TB test look like?

What does a positive TB test look like?

Skin test: If you had a PPD skin test and you have no risk factors, a positive test is when after 48 to 72 hoursyou have swelling in the site and redness that measures more than 15 mm, it is considered a positive tb. Test. ...Read more

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What should my skin look like after taking a TB test?

What should my skin look like after taking a TB test?

See below: A positive PPD is determined by the presence of swelling(induration) around the injection site. Little or no swelling indicates a negative test. Reddness is not used to determine a neg or pos test. ...Read more

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When you take TB test and no bubble pops up is it negative?

A positive: Tb test is associated with elevation you can feel at the injection site -- not likely to be a discrete bubble. Redness doesn't count -- you have to feel something. ...Read more

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When you get a TB test and no bubble pops up does that mean its negative?

Yes: If there is no raised area which measures at least 5 mm in diameter the test should be considered negative. ...Read more

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If i tested negative from a TB test and had been around someone who tested positive am i at risk of contracting tb?

TB risk: Yes, the PPD test is not 100%. You might want to get it repeated a month later to see if it is booster positive. Of course it is also possible that you didn't catch it. Many doctors are around people with TB a lot and never catch it. ...Read more

Dr. Klaus D Lessnau
1,159 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