how many days until you test for tb
Appraisal form. Each TB test requires two visits as each test must be read 48-72. hours after it is placed. 3. If you have had a negative Tuberculosis (TB) skin test within the past 12 months, you must have documentation on file at the Nursing program office. You must. also obtain another TB test which will be considered the second of the 2-Step. test.