Which assessment finding would best indicate a positive Mantoux tuberculin skin test in a client?

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Multiple Choice

Which assessment finding would best indicate a positive Mantoux tuberculin skin test in a client?

Explanation:
Reading the Mantoux test centers on the induration—the firm, raised, hardened area at the injection site. That indurated size is what determines a positive result, not just redness (erythema) or other skin changes. An induration measuring 15 mm is typically considered positive in many adults, indicating tuberculin sensitivity. The surrounding erythema doesn’t by itself define positivity, and vesicles or a circle of blanching aren’t used to interpret the test. So the best indicator of a positive reaction is a measurable induration of 15 mm (even if it’s surrounded by erythema).

Reading the Mantoux test centers on the induration—the firm, raised, hardened area at the injection site. That indurated size is what determines a positive result, not just redness (erythema) or other skin changes. An induration measuring 15 mm is typically considered positive in many adults, indicating tuberculin sensitivity. The surrounding erythema doesn’t by itself define positivity, and vesicles or a circle of blanching aren’t used to interpret the test. So the best indicator of a positive reaction is a measurable induration of 15 mm (even if it’s surrounded by erythema).

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