A patient who had a Mantoux test for tuberculosis two days ago has a 2 mm area of erythema at the site of the test. The nurse concludes that this patient's response
1. is negative.
2. is positive for tuberculosis.
3. should be followed up with a tine test.
4. is unable to determine the presence of tuberculosis.
Correct Answer: 1
Intradermal PPD or Mantoux test is read within 48 to 72 hours, the peak reaction period, and recorded as the diameter of induration (raised area, not erythema) in millimeters. The area on the patient is erythematous, not an induration. No follow up is needed as this patient's response is by definition a negative one.
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