Respiratory Question #27
The clinic nurse reads the client’s Mantoux test as positive and explains that the finding means:
- That the client is immune to tuberculosis.
- The induration is at least 2 mm.
- The client has an active case of tuberculosis.
- The client has been exposed to the Mycobacterium tuberculosis.
A positive Mantoux test means that the client has been exposed to the Mycobacterium tuberculosis. It does not measure immunity, but the degree of hypersensitivity to tuberculin. Reaction is measured by induration (NOT erythema) and is considered positive if 5mm or more size induration. It does NOT mean an active case of tuberculosis.