allergic reaction to tb skin test

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Dr. Cornelia Franz answered:

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

Was it allergic?

Allergies
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.
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Dr. Marcelo Laufer answered:

Can all europeans test positive for tuberculosis on the tb skin test because europeans get a vaccine for it?

No

Skin
if you get bcg (tb vaccine) you can get false positive ppd for up to 4 years. A blood test quantiferon will differentiate false positives from true positives
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If my tb skin test ran positive but I've never had tuberculosis, does that mean I have latent tb? And do I HAVE to take antiobiotics if I do have it?

Possible exposure.

Mycobacterium_tuberculosis_infection
If PPD is positive than you need a screening Chest xray. If Xray negative than 9 months of One med INH should be taken to prevent activation of possible dormant TB
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Dr. Carlo M. Hatem answered:

Is it possible for a person to have an alleregic reaction to a tb skin test, if so what are the symptoms?

Yes

Tuberculosis
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.
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Dr. Monib Zirvi answered:

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

Skin
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.
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Dr. Lokesh Guglani answered:

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

Different cutoffs

Skin
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.
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Is it okay to tan after tb skin test?

Yes

Tuberculosis
There is no reason to alter your schedule after a TB skin test.
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Dr. Jay Park answered:

Can induration on tb skin test be deep?

No

Tb_skin_test
Induration produced by TB skin test is a raised bump.
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Dr. Lokesh Guglani answered:

Can a TB skin test be read 24 hours later?

No

Tuberculosis
It is recommended to wait for at least 48 hours before interpreting the size of the swelling arising at the site of the TB test. This is because the swelling continues to increase for the first 48 hours & that is how this test has been standardized. Please make sure that you do not get your test done on a Thursday, so the 48 hours time point won't come over a weekend.
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Dr. Jay Park answered:

Tb skin test and antibiotics, are they related?

No

Tb_skin_test
Adminitration of antibiotics should not affect the TB skin test.
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