Collection Information: As of March 1, 2019, FOBT for inpatients at LHSC and St Joseph's Health Care will be discontinued. Feedback from Inpatient Medicine who had the greatest utilization rates was sought and there was general agreement. At this point in time, Emergency Departments and Pediatrics will be excluded from this change until further consensus can be reached.
Interpretive Comments: Screen test for colorectal cancer.
Interfering substances that may cause false-positive test results include dietary red meat, ASA (greater than 325 mg/day), corticosteroids, phenylbutazone, reserpine, anticoagulants, antimetabolites, and cancer chemotherapeutic drugs.
Dietary iron supplements will not produce false-positive test results.
Interfering substances that may cause false-negative test results include ascorbic acid (Vitamin C) in excess of 250 mg/day.
Hemoccult tests are positive at a daily blood loss equal to or greater than 10 mL.