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Doctor insights on: How Long Are Tb Test Results Good For

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How long are TB test good for?

How long are TB test good for?

Until today: You tested negative today? Great. But maybe you will inhale the bug tonight? Then your TB test will change. Once positive always positive. ...Read more

Dr. Scott Lindquist
609 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 do positive TB test results mean? How should I interpret the positive result of a TB test?

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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How long should you wait in order to repeat a TB test ?

Generally 6 weeks: The need to repeat a TB test generally depends on each individual's previous test results, presence of symptoms & risk factors for exposure to tb. An interval of at least 6 weeks is generally recommended. Talk to an infectious disease specialist for proper interpretation of your testing. ...Read more

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How long is TB test takes and what is the symptoms and causes of tb.

How long is TB test takes and what is the symptoms and causes of tb.

What test was done?: Skin test takes 48 hours and needs to be interpreted by a qualified professional, i.e.; whoever placed the test. Blood draws can give the answer in 1-2 days and may be indicative of past infections. Tb is an infection caused by a bacteria. It requires multiple antibiotics for months to eradicate. If there is an active infection of the lungs, it can be highly contagious. Symptoms are variable. ...Read more

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How long would it take for TB test marks to go away? Mine came back neg but the mark went from unremarkable to large and red after 4 days now. Thx.

TB Test: there can be several reasons why a TB test takes longer to reactt..If you do have a large reaction as you describe you should go back to your doctors office to show it to them as theymay decide it is a delayed positive test ...Read more

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TB test: neg >72 hrs but now large lump as time goes on? How long for mark to go away?

TB test: neg >72 hrs but now large lump as time goes on? How long for mark to go away?

Negative, give time: As long as there was no hardened lump at the infection site within that first 72 hours that was greater than 15mm (or less if you have risk factors), you are still considered negative. It can take some people up to a week or so for the redness and swelling to recede. Try ice several times a day to help with any swelling. ...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

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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

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Tb skin test negative, quentform TB test negative, bone marrow biopsy results indicative of TB (reacts to ziehl niehlssen), PCR negative. How come?

No...actually: The zn stain is a broad stain for acid fast bacilli of which mycobacterium tuberculosis is one of many. The specific tests like quantiferon or the pcr test are against you having tb. The culture is the "gold standard" but you will need to wait for it. It might turn out be a cousin of TB and that too will grow out of culture. Stay on TB meds until they are certain of the AFB positive organism. ...Read more

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Please tell me what a normal result after a TB test (tuberculosis) looks like?

TB: Tuberculin Tine Test- is smooth to moderately deep palpation. What is important is what it feels like - not what it looks like. ...Read more

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Does a TB test hurt?

Does a TB test hurt?

Not really: It is a tiny needle, just within the layers of the skin to create a fluid bubble. Takes a few seconds to apply. ...Read more

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What is a 2-part TB test?

Outdated?: May be tuberculosis skin testing? Igra or quantiferon gold blood testing is at least as good or even better. Discuss with your doc. The blood test is usually better than the skin test. ...Read more

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What does a + TB test look like?

What does a + TB test look like?

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

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Can I have a TB test with a cold?

Yes: The memory cells for TB are in the body and the test will still be valid if positive. The only problem are in people who have lower immune system but not quite bad enough to cause reactivation as they can develop anergy or false negative test. ...Read more

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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. Klaus d Lessnau
1,207 doctors shared insights

Tuberculosis (Definition)

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