When to Do Ppd Test?

All healthcare workers must be routinely screened for TB. You also need a PPD skin test if: you've been around someone with TB. you have a weakened immune system due to certain medications such as steroids or certain diseases such as cancer, HIV, or AIDS.

When should PPD test be done?

Doctors should read skin tests 48-72 hours after the injection. The basis of the reading of the skin test is the presence or absence and the amount of induration (localized swelling). A negative test does not always mean that a person is free of tuberculosis.

How often do you need a PPD test in healthcare?

If you work in health care or are at risk for getting TB, you also should have a tuberculin skin test (TST) once or twice a year. This test shows if you carry the bacteria that causes TB. Workers in certain areas may need TSTs more often. Ask your employer if you have questions.