Clinics and Departments

Laboratory Services

Lab Dept:

Other Fluids

Test Name:


General Information

Lab Order Codes:



Gastric Occult Blood; Occult Blood, Gastric

CPT Codes:

82273 - Blood, occult, by peroxidase activity qualitative; other sources, 1 – 3 simultaneous determinations

Test Includes:

Rapid screening test designed for detecting the presence of occult blood of gastric aspirate or vomitus.


Lab Testing Sections:


Phone Numbers:


Saint Paul:




Test Availability:

Daily, 24 hours

Turnaround Time:

2 hours

Special Instructions:

Requisition must state specific date/time of collection.


Specimen Type:

Gastric aspirate or vomitus


Sterile container


0.5 mL


Gastric aspirate

1. The patient should fast prior to the procedure.

2. Pass a well-lubricated tube orally or nasally through to the stomach.

3. Perform the lavage.

4. Before removing the tube, release the suction and the clamp to prevent mucosal trauma and/or aspiration.

5. Place specimen in sterile container.


● Transport fresh specimen to the Microbiology Laboratory immediately at room temperature.

● Refrigerate specimen if processing is delayed up to 24 hours.

Sample Rejection:

Specimen with a transit time exceeding 2 hours after collection; specimen not submitted in appropriate transport container; improperly labeled specimen; insufficient volume; external contamination. If an unacceptable specimen is received, the physician or nursing station will be notified and another specimen will be requested before the specimen is discarded.


Reference Range:

Negative to trace


Gastroccult® test results can be used as an aid in diagnosis, and are not intended to replace other diagnostic procedures such as gastroscopic examination or x-ray studies.


Gastroccult® SENSA®

Additional Information:

The identification of occult blood can be useful in the early detection of gastric trauma or deteriorating gastric condition. Standard fecal occult blood tests lose sensitivity at low pH levels and are not suitable for use with gastric samples. Gastroccult® is free from interference by normal concentrations of cimetidine (Tagamet), iron or copper salts. Fecal occult blood systems are affected by these interferences.


Cook, JH, and M Pezzlo (1992). Specimen receipt and accessioning. Section 1. Aerobic bacteriology, 1.2.1-4. In HD Isenberg (ed) Clinical Microbiology Procedures Handbook. American Society for Microbiology, Washington DC

Miller, J Michael (1999) A Guide To Specimen Management in Clinical Microbiology, American Society for Microbiology, Washington DC

Miller, J Michael, and HT Holmes (1999) Specimen Collection, Transport, and Storage In PR Murray et al, (ed), Manual of Clinical Microbiology, 7th edition, American Society for Microbiology, Washington DC, pp 33-104


11/10/2009: pH no longer performed as part of the testing.

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