Laboratory Test Information Guide

Details for Fecal Occult Blood-Available for Emergency Departments and Pediatrics Only

Test Name: Fecal Occult Blood-Available for Emergency Departments and Pediatrics Only
Alternate Name(s):  
Laboratory: Core (UH)
Specimen Type: Fresh random stool applied to Hemoccult card
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.
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
4 hours
1 hour
Reference Range: Negative
Effective Date: 2009-08-27
Revised Date: 2019-03-01
Critical Value:  
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.
Special Processing:  
Method of Analysis: Hemoccult kit (Beckman Coulter Inc.)
Critical Information Required:  
Storage & Shipment:  
System Codes: 
Referred To:  

Questions? Comments? Contact Laura Gopaul