QuestionMarch 21, 2026

Which event can alter a patient's guaiac test results? A The stool specimen did not contain urine. B The potient consumed fruit juice before the test. C The patient consumed organ meat before the test. D The nurse used tongue blades to transfer the stool.

Which event can alter a patient's guaiac test results? A The stool specimen did not contain urine. B The potient consumed fruit juice before the test. C The patient consumed organ meat before the test. D The nurse used tongue blades to transfer the stool.
Which event can alter a patient's guaiac test results?
A The stool specimen did not contain urine.
B The potient consumed fruit juice before the test.
C The patient consumed organ meat before the test.
D
The nurse used tongue blades to transfer the stool.

Solution
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Answer

C The patient consumed organ meat before the test. Explanation 1. Identify the purpose of a guaiac test The guaiac test detects hidden (occult) blood in stool using a chemical reaction with hemoglobin. 2. Recognize possible interfering factors Certain foods, like red meat (especially organ meat, which contains peroxidase activity similar to hemoglobin), can cause false-positive results. 3. Eliminate incorrect options A: No urine is correct procedure, not a cause of altered results. B: Fruit juice generally doesn’t interfere unless high in vitamin C, which may cause false negatives; not as common as red meat interference. D: Using tongue blades is standard practice and does not alter results.

Explanation

1. Identify the purpose of a guaiac test <br /> The guaiac test detects hidden (occult) blood in stool using a chemical reaction with hemoglobin. <br />2. Recognize possible interfering factors <br /> Certain foods, like red meat (especially organ meat, which contains peroxidase activity similar to hemoglobin), can cause false-positive results. <br />3. Eliminate incorrect options <br /> A: No urine is correct procedure, not a cause of altered results. <br /> B: Fruit juice generally doesn’t interfere unless high in vitamin C, which may cause false negatives; not as common as red meat interference. <br /> D: Using tongue blades is standard practice and does not alter results.
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