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:

Minneapolis:

Saint Paul:

 

612-813-5866

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.

● 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.

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® 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.

References:

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

Updated:

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



  Lab Test Directory
    Chemistry
    Coagulation
    Flow/Immunology
    Hematology
    Microbiology/ Virology
    Other Fluids
    Pathology
    Serology
    Transfusion Services
    Urine/Stool

  Search Lab Test Directory
    List All Documents

  Lab Staff

  E-mail Lab Services