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Doctor insights on: Tb Skin Test Allergic Reaction

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Dr. Christopher Crosby
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Dr. Scott Lindquist
539 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 happens if you have allergic reaction to TB skin test does it mean that you have tb?

What happens if you have allergic reaction to TB skin test does it mean that you have tb?

Was it allergic?: Was the reaction an allergic reaction or was it a positive sin test? There are components in the test that one can react to in an allergic fashion...The area can be red and itchy. But if it is raised and red and approx the size of a dime, it is a positive test and means you have been exposed to tb. ...Read more

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Dr. Christopher Crosby
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10 years in practice
92K people helped
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Is it possible for a person to have an alleregic reaction to a TB skin test, if so what are the symptoms?

Yes: In rare cases, the reaction to the skin test can be so severe as to cause skin peeling and even an ulceration. This is not an allergy. Theoretically you can have an allergy to the skin test, but it is exceedingly rare. ...Read more

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Tested positive for TB skin test in the past, and was given TB skin test to recheck, now have the reaction on both arms. Doc was told she tested +.

Tested positive for TB skin test in the past, and was given TB skin test to recheck, now have the reaction on both arms. Doc was told she tested +.

Positive : If the TB skin reaction site is firm and raised and is over 15 mm in diameter in an otherwise healthy adult, it is considered a positive reaction and requires treatment. Please see an infectious disease doctor or primary care physician to discuss treatment options. ...Read more

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Dr. Christopher Crosby
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10 years in practice
92K people helped
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What can be done to determine if you have positive result for TB skin test?

What can be done to determine if you have positive result for TB skin test?

Different cutoffs: Positive result for TB skin test is based on the size of the swelling (induration) at the site of TB test & additional risk factors that you have for acquiring tb. There are 3 cut offs for determining positive result (5, 10 & 15mm) & each one has different criteria for being used as cutoff for your test. Talk to your doctor to find out whether your test is positive or not based on these factors. ...Read more

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I just had my TB skin test on Thurs and I noticed my skin is a little bit elevated at the site of injection with erythema around it??positive result??

I just had my TB skin test on Thurs and I noticed my skin is a little bit elevated at the site of injection with erythema around it??positive result??

Depends: on the onset of redness/elevation from the time testing and the diameter of the elevated area, also if you have had BCG vaccination as a child, that can be very well a false positive test, alternate blood testing can be used, good luck ...Read more

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What do you suggest if i had a TB skin test (injection) 3 days ago yet there isn't any reactions (red spots) is that okay?

What do you suggest if i had a TB skin test (injection) 3 days ago yet there isn't any reactions (red spots) is that okay?

Negative test: If the test is done properly no bump means that the test is negative. sometimes a second test is done after 2 weeks (like a booster) to rule out a false negative test. ...Read more

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If I have a positive TB skin test, does that mean I have tb?

If I have a positive TB skin test, does that mean I have tb?

Not necessarily: (+) PPD means that you have been exposed to the TB agent. It doesn't say when. So if you had the TB in the past, it still will be (+) because your body "remembers" from the previous exposure. The greatest risk is if the TB agents are latent in your body, that's why everyone with a (+) PPD will have either a complete treatment with 4 medications or a mild one with only one. Your PPD will remain (+). ...Read more

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What will happen if you scratch the patch of skin you got a TB skin test on?

Probably OK: Unless it is a big scratch leading to a large hematoma, it is unlikely that it would affect the skin test reading at 48 hrs. ...Read more

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Dr. John Chiu
2,288 doctors shared insights

Allergies (Definition)

Essentially allergies occur when your immune system goes crazy and decides to has to fight against things it should be ignoring. The immune system of people without allergies simply ignores the pollen in the air or the dander on their cat while an allergic person's immune system creates cells to fight against the pollen or dander. The allergic reaction causes the ...Read more


Dr. Klaus D Lessnau
1,134 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


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Dr. Christopher Crosby
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10 years in practice
92K people helped
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