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Doctor insights on: How Long Is A Tb Test 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
561 doctors shared insights

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


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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 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 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?

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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Where do you go to get a quick and inexpensive TB test?

Clinic/public health: Since TB infection is a public health issue, your local public health department website may have a list of clinics. The clinic will perform a standard skin test called a ppd and they will ask you to return to have it read. ...Read more

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What happens during a TB test? I know that you get a shot, but what happens afterwards?

What happens during a TB test? I know that you get a shot, but what happens afterwards?

It depends: There are 2 types of tests used to "screen" people for tb. The skin test involves an injection which leaves a small bump under the skin. Your provider will then wait 48 to 72 hours later to "read" the result. The injection may lead to swelling or redness which the provider will interpret & measure. Not all skin changes mean the TB test is positive. A routine blood test for TB is also available. ...Read more

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Dr. Klaus D Lessnau
1,159 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