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Test Code GAOC Gastric Occult Blood and pH

Important Note

Incompletely cooked meat, raw fruits/vegtables can produce a false postive.

Ascorbic acid (vitamin C) may cause false negative results.

Performing Laboratory

Memorial Hospital Laboratory- Automated Procedures  304-388-5953       
General Hospital Laboratory 304-388-6244
Women and Children's Hospital Laboratory 304-388-2385
Teays Valley Hospital Laboratory 304-757-1770
Plateau Medical Center Laboratory 304-469-8621
Greenbrier Valley Laboratory 304-647-6060

Specimen Requirements

Gastric contents or aspirate in a sterile screw-capped, plastic container.

5 mL (minimum 1mL) 

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient

Storage and Stability

Room Temperature 15-30o C 24 hours
Refrigerated 2-8o C 5 days

Samples for pH testing should be analyzed as soon as possible.

Reference Values

Blood Negative
pH 1.0-4.0

Methodology

Guaiac/Peroxidase Card Test

Days Test Set Up and Turnaround

Monday through Sunday, Continuously

Routine- results usually available within 24 hours

CPT Coding

82271-gastric blood

83986-gastric pH