What kind of tests are used to diagnose TB?

What kind of tests are used to diagnose TB?

CDC twenty four seven. Testing & Diagnosis. There are two kinds of tests that are used to detect TB bacteria in the body: the TB skin test (TST) and TB blood tests. A positive TB skin test or TB blood test only tells that a person has been infected with TB bacteria.

What do you need to know about TB risk assessment?

Information from the baseline individual TB risk assessment should be used to interpret the results of a TB blood test or TB skin test given upon hire (i.e., preplacement). Health care personnel with a positive TB test result should receive a symptom evaluation and a chest x-ray to rule out TB disease.

What does a positive TB blood test mean?

Positive TB blood test: This means that the person has been infected with TB bacteria. Additional tests are needed to determine if the person has latent TB infection or TB disease. Negative TB blood test: This means that the person’s blood did not react to the test and that latent TB infection or TB disease is not likely.

How often should health care workers be tested for TB?

A repeat TB test (e.g., TB blood test or a TB skin test) is not required. Annual Screening, Testing, and Education. Annual TB testing of health care personnel is not recommended unless there is a known exposure or ongoing transmission at a healthcare facility.

Which test is used to identify the organism that causes TB?

It is also known as the tuberculin test, the purified protein derivative test for tuberculosis, and more simply as the PPD test. This test is used as a diagnostic or more commonly as a screening measure to determine if someone has been exposed to Mycobacterium tuberculosis , the bacterium that causes TB.

What should be done if you test positve for TB?

If you have a positive skin or blood TB test, your doctor may give you a chest X-ray. They’ll look for spots on your lungs or any changes caused by TB. You may also take something called a sputum smear or culture test. Your doctor will take a sample of the mucus that comes up when you cough and test it for TB bacteria.

Who should be screened for TB?

People seeking care who may be eligible for TB screening include people with medical conditions that constitute risk factors for TB (such as people living with HIV and people with diabetes mellitus) who may seek care for reasons other than symptoms compatible with TB.

What two test are acceptable for TB screening?

TB blood tests are also called interferon-gamma release assays or IGRAs. Two TB blood tests are approved by the U.S. Food and Drug Administration (FDA) and are available in the United States: the QuantiFERON®-TB Gold In-Tube test (QFT-GIT) and the T-SPOT®.TB test (T-Spot) .