If a patient had melena, his/her laboratory report would show a guaiac-positive stool.

Name: If a patient had melena, his/her laboratory report would show a guaiac-positive stool.
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Quizplus · Accepted Answer

Melena refers to black, tarry stools that result from bleeding in the upper gastrointestinal tract. A guaiac test is a screening test for the presence of blood in stool, and a positive test indicates the presence of blood. Therefore, a patient with melena would have a guaiac-positive stool.

If a Patient Had Melena, His/her Laboratory Report Would Show