When Does A Tb Test Expire?


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Neal Widdows Profile
Neal Widdows answered
For most medical tests of tuberculosis (TB) you will need to get them done normally after 12 months. But the best thing is to ask your doctor or if there are any symptoms of TB which may appear.

You may need Purified Protein Derivative (PPD) skin tests. TB is a nasty virus that affected several thousand during the Black Plague. It attacks the lungs but can also affect other parts of the body and spread through the air when people with an active Mycobacterium tuberculosis (MTB) infection either cough, sneeze, or otherwise transfer their saliva through the air.

There has been recent controversy surrounding this with a recent call to ban spitting on the street as there may be a small chance one can contract TB due to the moisture in the air.

Some classic TB symptoms to watch out for include a chronic cough with blood-tinged sputum, fever, night sweats, and weight loss. The usual diagnosis relies on radiology by means of an X-ray.

Treatment is difficult and requires long courses of antibiotics to be taken. Yet if you have a negative skin test, you need a repeat test probably at least every four years. If you do contract a positive skin test, you must have an initial chest X-ray.

And following this, you still need to be screened every four years. The injection against TB is simple and is done with a small amount of PPD. This is injected with a small needle just under the skin on the forearm and is monitored for two to three days after the injection to see if a bump develops. A nurse or physician needs to measure the size of the bump in order to see if you have a positive skin test. A positive skin result however, does not mean that a person has active TB.
Adam Profile
Adam answered
Most medical tests expire after one year, but I have heard some say that an x-ray check for tb lasts longer.  The best thing to do would be to ask your place of employment or wherever you are having the test done for, how often do they require PPD skin tests.

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