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Doctor insights on: Tb Skin Test Allergic Reaction

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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. Dennis Higginbotham
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Dr. Scott Lindquist
515 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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Is it possible for a person to have an alleregic reaction to a TB skin test, if so what are the symptoms?

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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Dr. Dennis Higginbotham
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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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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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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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Dr. Dennis Higginbotham
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24 years in practice
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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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What is a TB skin test and what are the procedures (injection)?

Skin test: It is a liquid (purified protein derivative) that is injected under the skin on the forearm (the ventral side or underside of the forearm) as a bleb that goes away. It tests to see if you were exposed to tb. When it is positive there is an indurated (raised and red) reaction bigger than a dime. It has to be read 2 days after it is done. ...Read more

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What do you suggest if my previous TB skin test while negative while current is positive?

Need care!: Your TB test has turned positive - this is very significant. The guidelines are very clear what needs to happen now with further diagnostic studies, including chest x-ray, and then treatment. If your primary care doctor is not comfortable caring for TB, see infectious disease or pulmonary specialist ASAP to begin evaluation and care. There are great ones in Columbus area - call for appointment now ...Read more

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Dr. John Chiu
2,167 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
1,104 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. Dennis Higginbotham
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