Why a Two-Step Test? A single TST may have a negative reaction yet awaken an immune response to the bacteria in an individual who has been previously exposed to TB.
A total of 4 visits are required to complete this test. After administration of the first step, the individual must return 48-72 hours later to have the TST read. The Mantoux TST is a standard method of determining if a person has been infected with the Mycobacterium Tuberculosis.Ī 2-step TST involves two tests performed within one to four weeks of each other. Check your program requirements for specifications.
Infection Prevention and Control (IPAC)Īre you entering post-secondary education and require a Tuberculin Skin Test (TST)? For students in Community Studies, Health Sciences or other programs where the placement site requests pre-placement health clearance will require a 2-step TST.
