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Doctor insights on: What Does A Positive Tb Skin Test Look Like

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Dr. John Chiu
Board Certified, Allergy and Immunology
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Dr. Eric Weisman
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Dr. Scott Lindquist
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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


Dr. Andrew Turrisi
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Tb i had my skin test - redness 40 mm i will do the chest xray tomorrow ! but am i contagious ? What are the side effects of the treatment for TB ?

Tb i had my skin test - redness 40 mm i will do the chest xray tomorrow ! but am i contagious ? What are the side effects of the treatment for TB ?

If you are: Coughing, you are able to spread the disease. They may try to culture to see for check for variants. Standard drugs are inh/ethambutol. Duration of therapy is long. Side effects not too troubling. ...Read more

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Dr. Eric Weisman
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Dr. Gaston Moran Celayes
Board Certified, Internal Medicine
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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. Nela Cordero
Board Certified, Pediatrics
48 years in practice
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Could a positive TB skin test mean you always have tb?

Could a positive TB skin test mean you always have tb?

POSITIVE PPD: NO. Sometimes it is due to immunization given before. Take a chest x-Ray to find any lesion in the lungs. ...Read more

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Dr. Eric Weisman
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Dr. Oscar Novick
Board Certified, Pediatrics
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If I had a positive TB skin test but a negative xray do I need medication? My doctor didn't say I did

Positive PPD: If you have a positive tuberculin test and a negative chest xray many doctors will oder a sputum culture. If you have a positive sputum treatment is indicated. However, many doctors will treat prophylactically with isoniazid for protection ...Read more

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Dr. Oscar Novick
Board Certified, Pediatrics
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Dr. Harris Lilienfeld
Board Certified, Pediatrics
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Dr. Cornelia Franz
Board Certified, Pediatrics
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If you have a TB skin test and it turns a little red and looks like a bug bite is this a positive or negative test?

Depends : On the size of the swelling or induration. This is why they need to be seen and read 48 hours after being placed. ...Read more

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Dr. James Ferguson
Board Certified, Pediatrics
40 years in practice
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What to do if I have a positive on my TB skin test?

What to do if I have a positive on my TB skin test?

Seek out information: Most will be followed first with a chest x-ray looking for active pulmonary disease. If negative, you are likely started on one TB drug, depending on your local as treatment for latent (quiet) tb. If you are found to have active tb, you are likely started on a 4 drug program that lasts for up to a year to knock it out. Get with your doc to see. ...Read more

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Dr. Lois Freisleben-Cook
Board Certified, Developmental and Behavioral Pediatrics
35 years in practice
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What does it mean if I have a negative TB skin test yet a positive blood one?

What does it mean if I have a negative TB skin test yet a positive blood one?

IMMUNE PROBLEM: Both tests detect prior exposure to TB. A situation of diminished immune function, called anergy, can make the skin test appear negative. If you have a positive blood test you will need to have a CXR to exclude active infection and may need prophylaxis . ...Read more

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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. Eric Weisman
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