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Doctor insights on: Signs Of A Positive Tb Test

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What does a positive TB test mean?

What does a positive TB test mean?

Chest X ray: It is possible to have active TB with very little symptoms especially early on. However, it is more than likely that you carry the germ for TB in a dormant form, this is called latent tb. No symptoms are expected with latent tb. ...Read more

Dr. Scott Lindquist
615 Doctors shared insights

Mycobacterium Tuberculosis Infection (Definition)

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 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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How do I know if I have a positive TB test?

If there is a bump: When TB infects the body the infection gets walled off by antibodies. The medical person injects a manufactured antibody under your skin that reacts to the TB antibody. If a bump appears at the injection site after 48 hours it means you have the antibody to TB already in your body and therefore have TB infection. It does not mean that you have active disease or are contagious. ...Read more

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How quickly will you know if you have a positive TB test?

How quickly will you know if you have a positive TB test?

48-72 hours: Tb test is meant to be interpreted in 48-72 hours after being administered on the forearm. Make sure that the induration (not redness) is measured in that time frame & results documented by a health care provider. Further testing may be determined based on your results from the TB test. ...Read more

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How would I be able to tell if I have a positive TB test?

Size of induration: After the TB test, the skin at the site can develop swelling (induration). The size of this swelling (measured in millimeters by a health care provider within 48-72 hours) determines whether you have a positive result or not. It is important to not measure the area of redness but the actual size of the swelling around the test site. The cut off value for positive test is based on yr risk factors. ...Read more

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Could you tell me what happens if I have a positive TB test?

Latent vs active TB: If you have a + PPD then you will be screened to determine if you have TB infection or TB disease. The physician will obtain a medical history, physical examination, chest x-ray, & any other pertinent lab tests. ...Read more

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What does a positive TB test look like? How is this treated?

What does a positive TB test look like? How is this treated?

What is important: Is what it feels like - not how it looks. Induration is palpated & measured. Treatment (such as INH) is determined once it is established where this is latent or active TB and the type. ...Read more

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I'm taking inh treatment for a positive TB test. Is it safe to get pregnant?

I'm taking inh treatment for a positive TB test. Is it safe to get pregnant?

I would wait: You should be done in 6-12months with your inh, and it would be prudent to wait if possible. If you are already pregnant on inh, the risk of affecting the baby is low, but present, discuss with your infectious disease doctor. ...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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If you were going to have a bad reaction (not a positive reaction) to a TB test (under the skin) would it happen right away or can it take days?

If you were going to have a bad reaction (not a positive reaction) to a TB test (under the skin) would it happen right away or can it take days?

1 to 3 days: It can take 1 to 3 days to get to its worst. This is for some people that have reactions after they have a positive test. If you are referring to a type of allergic reaction, this usually be almost right away. ...Read more

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What if you had a positive TB test and on meds for a year was told not to get another TB shot but did

What if you had a positive TB test and on meds for a year was told not to get another TB shot but did

Stay Positive: Once you have had positive TB test (ppd), it remains positive for life. It means you have been exposed to TB bug sometime in the past (latent tb). Since you've had treatment for latent tb, further PPD testing is not needed. Screening for active TB disease on basis of symptoms & xrays periodically is all you need. Extra TB shot (? Ppd I assume) will not harm you but you should let yr doc know abt it. ...Read more

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Does the TB test commonly appear positive on the first day?

Yes: The TB test can become positive within the first day in someone that has been exposed to TB in the recent past. ...Read more

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How difficult must an induration be to be considered positive TB test?

PPD: It is not about hardness of the induration it is about the size of the area of induration. It is harder than surrounding skin. ...Read more

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What do positive TB test results mean? How should I interpret the positive result of a TB test?

Infection with Tb: When someone is infected with tuberculosis (TB) germs, the body develops a protective response against them. The TB skin test is a test of the body's response to tb, not the germs themselves. One can have an active infection where they are coughing out TB germs and are a risk to spread tb. Or the body may have had the infection long ago and controlled it so there is no risk now of spread. ...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

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Can weed cause a false positive TB test?

No: Have not heard about that, no relationship., . ...Read more

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Will TB test be positive if one had primary complex?

Yes, I think so.: It may not be an absolute certainty, but I would advise the physician of the fact that there was a primary complex diagnosed and treated (assuming it was) either before the TB test or at the time of results if they are positive. I have never had positive results, but I was told that I had a primary complex - I always tell them the history just to be informationally complete. Best! ...Read more

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Tb test site bled right after injection. Can this give a false positive? Obviously, it was not intradermal. Don't answer if you don't know how to.

Check with your doc: The test was not appropriately administered. You want to ask your doc for a new one. Or get the igra blood test which is better anyway. The skin test is almost in the museum of history of medicine. ...Read more

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Why would someone born in the Netherlands get a false positive on a PPD TB test?

Why would someone born in the Netherlands get a false positive on a PPD TB test?

Usually unknown: The reasons for false positive PPD are unknown. There is speculation that it could sometimes result from past infections with various TB-like bacteria. Such infections aren't very common, but they are equally frequent in the Netherlands as anywhere else. As long as the tested person is outwardly healthy and definitely does not have tuberculosis, this is nothing to worry about. ...Read more

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Did the TB test when I was small as far as I know it came back positive, I'm I at high risk if I was around someone with active tb. What should I do?

Get tested: Please see a doctor and get tested. You will need the quantiferon gold test. If positive, you'll need medication and chest x ray screenings. ...Read more

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Can DPT booster done at the same time affect TB test so that it is interpreted as false positive? In addition, TB test site bled right after injection

PPD: First- DTP injection does not affect the response to TB test
second- TB test is placed intra dermally - which means no bleeding at injection site. ...Read more

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I had bcg. What do I do in us when TB test is positive?

I had bcg. What do I do in us when TB test is positive?

BCG: Within 3 yrs after receiving BCG most individuals do not have false positive skin tests for tb. If one has a positive PPD skin test, the overwhelming probability is that they have inactive tuberculosis. ...Read more

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Why would someone born in india get a false positive on a PPD TB test?

Easy: What determines a false-positive test? Either not measuring induration, or that it was due to prior bcg, which seldom lasts more than 5 yrs. If someone has a negative PPD it means either that they do not have a focus of inactive tuberculosis or that they are anergic (incapable of reacting due to deficiency in immune mechanisms). ...Read more

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I am a medical assistant and had my TB test come back positive but cxr negative. Is there any follow up I should do?

I am a medical assistant and had my TB test come back positive but cxr negative. Is there any follow up I should do?

Yes: For a person with a positive PPD skin test and a negative chest x-ray, if he had a BCG vaccine in the past, he can do a quantiferon TB blood test to see if he was exposed to real TB or just to the BCG shot. If he never had a bcg, he can talk with his doctor to decide if he should take inh prophylaxis against tb. If it is not sure if he truly truly was positive on the skin test, he can repeat it. ...Read more

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If I take Benadryl (diphenhydramine) a day after I got the TB test will it interfere with it? (make it positive/negative)

No effect: The reactivity of the tuberculin test relies on immune factors not allergic responses. Benedryl will have no effect on that process. ...Read more

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Recently, I had a TB test come back positive. For the past 3 years, I've been having neurological problems. Could these two be related?

Could be: Not necessarily linked, but depending upon what the symptoms are, they could be linked. Seeing neurologist and/or investors disease specialist? ...Read more

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I have had 2 miscarriages. After going to? A gynecologist, my TB test come positive. Major problem?

I have had 2 miscarriages. After going to? A gynecologist, my TB test come positive. Major problem?

Miscarriage: Two miscarriages and a + TB test are not necessarily related. That you have a +tb test needs evaluation prior to pregnancy. ...Read more

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I had TB test done. Its been 24 hours and is slightly red at the site about the size of a nickel. No bump. Is this positive?

Not positive: You need to wait 48 hour to be able to interpret the test, but the redness does not matter. What determines a positive test is the size of the bump, and the size of the bump is considered in relation to the risk category that you are in. For most people the bump needs to be 10 mm or bigger to be called positive. ...Read more

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Are there good ways to get a chest X-ray for positive TB test?

Imaging center: Your doctor should have given you a referral slip for the chest xray. They may have a particular imaging place they want you to go to, but you can go to almost any imaging center or hospital. Most positive TB test chest x-rays will be normal so try not to worry too much until you have your results. ...Read more

Dr. Klaus d Lessnau
1,215 Doctors shared insights

Tuberculosis (Definition)

A potentially serious infectious bacterial disease that ...Read more