Difficulty: Medium
Average Score: 88%
Simulated
Passage / Scenario
A nurse is reading a tuberculin skin test for a client who received a protein derivative test 72 hours ago.Which of the following findings indicate a positive test?
Correct answer
A
Rationale
The correct answer is A because an induration measuring 10 mm is considered positive for a tuberculin skin test, indicating exposure to tuberculosis. A larger induration size suggests a stronger immune response. Choice B, a reddened area with no induration, is not specific for a positive test. Choice C, an induration measuring 3 mm, is below the threshold for positivity. Choice D, a blister at the injection site, is a sign of irritation rather than a positive test result.