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Test Code OCCB Occult Blood in Feces Guaiac method

Specimen Type

Feces (stool specimen) collected on Hemoccult card

If Hemoccult cards are not available, the stool specimen can be submitted in a plastic urine container.


Sterile container

Turnaround Time

24 hours

STAT Days and Times Performed

Not Available

Days and Times Performed


Method Name

Guaiac Method

UCMC Collection Instructions

Patient given diet guidelines which include no red meat for 3 days prior to test and with restriction to oxidase rich vegetables (turnips, horseradish, artichokes, mushrooms, radishes, bean sprouts, cauliflower, oranges, apples, bananas, cantaloupes, grapes). Alcohol and aspirin especially together along with other gastric irritants should be avoided.

Test Limitations

Ascorbic acid (Vitamin C) may cause false negative results.

Additional Information

Some oral medications (e.g. aspirin, indomethacin, phenylbutazone, corticosteroids, reserpine, etc.) can cause G. I. irritation and occult bleeding in some patients. The Occult Blood Feces, Guaiac method (Hemoccult Sensa) is used for suspected upper GI bleeding. The Occult Blood Feces, Immunochemical method (Hemoccult ICT) may fail to detect upper gastrointestinal tract bleeding, producing a negative result. Therefore the Occult Blood, Feces Guaiac Method (Hemoccult Sensa) is used for suspected upper GI bleeding and Hemoccult ICT is used for suspected lower GI bleeding.

Fee Code






Reference Values

Negative for Blood