After administering the annual Mantoux tuberculin skin test to employees, the nurse instructs the staff to return within how many hours after administration to have the results determined?
12 to 24 hours 24 to 48 hours 48 to 72 hours 72 to 84 hours
12 to 24 hours 24 to 48 hours 48 to 72 hours 72 to 84 hours