Doctor insights on:
Signs Of A Positive Tb Test
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
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
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
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
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
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
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?
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
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
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
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
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
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
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
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
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
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
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
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
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.
I have had 2 miscarriages. After going to? A gynecologist, my TB test come positive. Major problem?
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
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
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