The nurse is administering a purified protein derivative (PPD) test to a homeless patient. Which of the following statements concerning PPD testing is true?
A) A positive reaction indicates that the patient has active tuberculosis (TB).
B) A positive reaction indicates that the patient has been exposed to the disease.
C) A negative reaction always excludes the diagnosis of TB.
D) The PPD can be read within 12 hours after the injection.
Ans: B
Feedback: A positive reaction means the patient has been exposed; it isn't conclusive of the presence of active disease. A positive reaction consists of palpable swelling and induration of 5 to 15 mm. The PPD can be read 48 to 72 hours after the injection. In patients with positive reactions, further studies are usually done to rule out active disease. In immunosuppressed patients, a negative reaction doesn't exclude the presence of active disease.
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