Test Overview

Test Methodology

Guaiac procedure for detection of occult blood.

Test Usage

This test is a qualitative method for detecting fecal occult blood which may be indicative of gastrointestinal disease. It is not a test for colorectal cancer or any other specific disease. Serial fecal specimen analysis is recommended when screening asymptomatic patients.

Reference Range*


* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Intake of foods such as red meat, broccoli, turnips, cauliflower, apples, oranges, mushrooms, and horseradish, and drugs such as colchicine and oxidizing drugs (like iodine and boric acid) may give a false positive result. Intake of vitamin C in excess of 250 mg/day may give a false negative result.

Test Details

Days Test Performed


Analytic Time

8 hours

Soft Order Code


MiChart Code

Occult Blood, Stool Card



Guiac Test
Hemoccult, Stool
Occult Blood, Stool Card

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Specimen Requirements

Rejection Criteria

Grossly bloody specimens are not acceptable.


100ml Plastic Specimen Container
Hemocult Slide

Additional Information

Please see Fecal Occult Blood, Immunoassay (IFOB) for qualitative detection of fecal occult blood in feces recommended for use in routine physical exams, monitor for bleeding in patients and screening for colorectal cancer or other GI disorders that can cause gastrointestinal bleeding (e.g., diverticulitis, polyps, and Crohn's disease).

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