Should a TST reading of >10 mm be accepted 7 days after the TST was placed?
If the TST was not read between 48–72 hours, another TST should be placed as soon as possible and read within 48–72 hours. However, certain studies indicate that positive TST reactions might still be measurable 4–7 days after the TST was placed. If the TST reaction is read as >15 mm 7 days after placement, the millimeter result can be recorded and considered to be a positive result. • Do health-care settings or areas in the United States exist for which baseline two-step skin TST for newly hired HCWs is not needed? Ideally, all newly hired HCWs who might share air space with patients should receive baseline two-step TST (or one-step BAMT) before starting duties. In certain settings, a choice might be offered not to perform baseline TST on HCWs who will never be in contact with or share air space with patients who have TB disease, or who will never be in contact with clinical specimens (e.g., telephone operators in a separate building from patients). • In our setting, workers are hir
