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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