How should guaiac tests be ideally performed to detect fecal occult blood

How should guaiac tests be ideally performed to detect fecal occult blood?

• Stool specimens should be collected over 3 consecutive days.

• Guaiac testing should be performed on a fresh specimen (< 7 days).

• Dry specimens should be rehydrated.

• Patients should refrain from eating red meat and cabbage, cauliflower, or broccoli.

• Avoid taking aspirin or NSAIDs for several days before the test.

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