Clinics and Departments

Laboratory Services

Lab Dept:

Other Fluids

Test Name:

OCCULT BLOOD, GASTRIC

General Information

Lab Order Codes:

OCBG

Synonyms:

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.

Logistics

Lab Testing Sections:

Microbiology

Phone Numbers:

MIN Lab: 612-813-5866

STP Lab: 651-220-6555

Test Availability:

Daily, 24 hours

Turnaround Time:

2 hours

Special Instructions:

Requisition must state specific date/time of collection.

Specimen

Specimen Type:

Gastric aspirate or vomitus

Container:

Sterile container

Volume:

0.5 mL

Collection:

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/Storage:

● Transport fresh specimen to the Microbiology Laboratory immediately at room temperature.
● Specimens are stable at room temperature for 24 hours.

Sample Rejection:

Specimen with a transit time exceeding 24 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.

Interpretive

Reference Range:

Negative to trace

Limitations:

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.

Methodology:

Gastroccult®

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.

References:

Gastroccult® Product Instructions 462405. DC, Beckman Coulter Inc., Brea, CA 92821, December 2013

Rosenthal, Pl, et al., Detection of Occult blood in Gastric Juice. J. Clin Gastroenterology 6:119-121, 1984

Updated:

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



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