Also known as: Purified Protein Derivative; PPD; Mantoux; Latent Tuberculosis Infection Test; Interferon-gamma Release Assays; IGRA
Formal name: Tuberculin Skin Test; Interferon Gamma Release Assays
Related tests: AFB Smear and Culture; Sputum Culture; Adenosine Deaminase
Why should I do it?
To help determine whether or not you may have a latent or active infection with the Mycobacterium tuberculosis bacteria
When should I do it?
When you have signs and symptoms consistent with tuberculosis (TB); when you have been in close contact with someone who is known or suspected to have TB; when you have diseases or conditions that weaken your immune system and put you at a greater risk of developing active TB; when you are confined in living conditions such as a nursing home, school, homeless shelter, migrant farm camp, or correctional facility; when you inject illegal drugs; when you have lived for a period of time in or come from a foreign country where TB is more common; when you have an occupation, such as health care worker, that will bring you into close contact with those who may have active TB; sometimes as part of an examination prior to starting school or a new job (such as a college student, teacher, or day-care employee)
What Kind of Sample is Needed?
For a tuberculin skin test, no sample is required. A small amount of purified protein derivative (PPD) solution is injected just under the first layer of skin of your inner forearm. For an interferon gamma release assay, a blood sample is drawn by needle from a vein in the arm.
Test Preparation Needed?