Doctor insights on:
What Does A Positive Tb Test Result Look Like
Positive test result for TB my husband got a job offer and had to get a TB test. He went back to get the results and the spot is slightly red and barely over 10 mm. He is convinced that the results are positive and as a result he won't get the job. The
Hello.: Hello. You can have an overlying are of redness, that doesn't mean the test is positive. I always used the ball point pen method to read the TB test. You gently move the pen back and forth to determine where there is underlying induration. Being PPD positive and having tuberculosis are two very different things. Please have him talk to the person who administered the test to find out the result. You are checking for inducation and not color. Take care. ...Read more
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
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
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
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
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
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
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
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
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?
Hi. I result with TB test positive. I'm taking medication. I did chest ray it comes negative. I'm worried about my doughter she comes positive to she is 5 years old. Please help.
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
See below: A positive PPD is determined by the presence of swelling (induration) around the injection site. Little or no swelling indicates a negative test. Reddness is not used to determine a neg or pos test. ...Read more
Positive PPD test: A positive TB test should look like hard, raised bump with size >5to15 mm depending of the risk category you are in. It should be read in between 48 to72 hours. It is the hardness and not redness which is read. Thanks. ...Read more
Doc: Either your blood test igra is negative or your skin testing does not show any "bump". This should always be checked by a professional since even health care workers report false results. Best to check with a doc and not pa or np or nurse. ...Read more
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
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
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
Tuberculosis vaccinated, TB test positive...Will my ANA be positive because of TB test positive due to vaccine?
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
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
Last week I got a TB test (injection tues., read thurs.) results were negative, what does this indicate?
That you: Haven't been infected by Mycobacterium tuberculosis.Get a more detailed answer ›
Depends: If your doctor suspects that you have open pulmonary tuberculosis, you could be prevented from going to work. ...Read more
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
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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