Definition of Tuberculin tine test:

The tuberculin tine test is used to determine whether someone has come in contact with the bacteria that causes tuberculosis.

How the test is performed:

This test uses a tiny spiked instrument to inject a small amount of the tuberculosis antigen just under your skin. This is most commonly done on the arm. Usually, the area is marked with an ink pen, so it can be checked for any redness and swelling at a later time, usually in 2 to 3 days.

Note: Another test, called the tuberculin skin test, is a more accurate than the TB tine test covered in this article, 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:

Some people feel a slight stinging sensation when the instrument is inserted under the skin. After the test, the area may itch or burn.

Why the test is performed:

This test helps determine if you have ever been exposed to tuberculosis. If you have ever been exposed to tuberculosis, your immune system produced antibodies to help fight the disease. These remain in your body. When this test is performed, those with antibodies to tuberculosis will have a positive test result.