The nurse evaluates the tuberculosis skin test results for a patient who recently emigrated from Southeast Asia
Which result is consistent with the presence of tuberculosis antibodies in the pa-tient's system if the nurse reads the test 72 hours after injection? a. The injection site is an 11-mm red, warm, swollen area.
b. The skin around the injection site is black, dry, and scaly.
c. The nurse palpates a hard, dense, raised area 14 mm across.
d. According to the patient, the skin around the injection site feels cool.
C
A tuberculin skin test indicating the presence of antibodies results in a palpable, indurated area at the injection site greater than 10 mm in diameter for a recent immigrant from Southeast Asia be-cause many immigrants from that area are exposed to tuberculosis. In addition, tuberculosis im-munizations are common in Southeast Asia; if a patient is tested after receiving the tuberculosis vaccine, the intradermal skin test will always be positive. Patients with no known risk factors have a positive test with a 15-mm induration, and an immunocompromised patient has a positive test with a 5-mm induration. This site is suspicious, but if it is not indurated, it does not indicate a positive result. Black, dry, scaly skin is consistent with necrotic tissue. A cool sensation around the injection site after a tuberculin skin test is an unusual finding.
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