Test Code LAB694 Stool Occult Blood
Clinical System Name
Stool Occult Blood
Synonyms
LAB694
BLOOD STOOL
BLOOD ST
Feces Occult Blood
Fecal Blood
Guaiac
Hemoglobin - Stool
RBC Stool
Hemoccult
Sample Requirements
Specimen: Stool
Container(s): Sterile Screw-Capped Container or a Hemoccult® card with adequate sample.
Preferred Vol: 1 gram stool
Minimum Vol: 1 gram stool
Notes: No diapers accepted. Fecal specimens should not be collected if hematuria or obvious rectal bleeding, such as from hemorrhoids, is present. Premenopausal women must be instructed to avoid collecting fecal specimens during or in the first three days after a menstrual period. Prior to collection the patient should avoid: red meat, turnips, horseradish, vitamin C (in excess of 250 mG/day), aspirin, and anti-inflammatory drugs. Foods to eat: small amounts of chicken and tuna, cooked fruits and vegetables, peanuts, popcorn, bran cereal. Since bleeding from gastrointestinal lesions may be intermittent, fecal specimens for testing should be collected from three consecutive bowel movements or three bowel movements closely spaced in time. Write collection date and time on the outside of each card. Each collection requires a separate order. Cimetidine (Tagamet) prescribed for ulcers has no effect on test. This test may NOT be used for gastric specimens. Stool samples in containers are stable for 36 hours and Hemoccult® cards are stable for 14 days.
Processing Instructions
Reject due to: Insufficient quantity, stools sent in diapers or formalin, Age of specimen
Spin: N
Aliquot: N
Storage location: Core 5 Refrigerator
Off-site collection: Send stool refrigerated in a Sterile Screw-Capped Container (No diapers). Send Hemoccult® cards room temp, protected from light, heat, and volatile chemicals. Please write the date and time of collection on the outside of each card. Each collection requires a separate order.
Stability
Specimen Type | Temperature | Time |
---|---|---|
Stool | RT |
≤ 36 h |
Stool | 2-8 C |
≤ 36 h |
Stool | -20 C or -70 C |
≤ 36 h |
Hemoccult® card | RT | ≤ 14 d |
Hemoccult® cards containing sample may be stored for up to 14 days at RT (15-30oC) before developing. Protect from light, heat, and volatile chemicals.
Availability
STAT | Performed | TAT |
---|---|---|
Y | 24/7 | 1 h |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Core Chemistry
Phone Number: 206-987-2617 (Client Services)
CPT Codes
82272
Methodology
Method: Guiac paper/Enzymatic reaction by Hemoccult®
Analytical Volume: 1 gram stool
Reference Range
Negative
Description
The Stool Occult Blood test is a rapid, convenient, and 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 diseases.