Tuberculin tine test

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Tuberculosis in the kidney

Tuberculosis in the lung

Tuberculin tine test

Definition:

The tuberculin tine test is used to determine whether someone has been exposed to tuberculosis.

Alternative Names:
TB tine
How the test is performed:

In this test, the tuberculosis antigen is injected just under the skin with a multi-pronged instrument. The antigen is located on the tines (spikes) that penetrate the skin. The site, most often on the arm, is usually labeled with ink so that it may be monitored.

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After 48 to 72 hours, if the result is positive, the skin will appear red and swollen like a mosquito bite where the antigen was injected. A negative test result may be a bit red but will not be swollen and firm like a mosquito bite.

Note: The tuberculin skin test is more accurate than the tine test and is the preferred method of determining exposure to tuberculosis.

How to prepare for the test:

There is no special preparation. People with dermatitis or other skin irritations on their arms may need to have the test performed at a different spot on the body.

How the test will feel:

When the antigen is injected, there is a slight stinging sensation where the tines are inserted. After the reaction begins, the area may itch or burn.

Why the test is performed:

This test is helpful in determining whether you have ever been exposed to tuberculosis. If you have been exposed to tuberculosis at any time in the past, antibodies are formed by your body and remain in your system; when the tuberculosis antigen is injected under the skin during the tine test, your body will have an immune response, and there will be an area of inflammation at the site of the injection.