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Test Code OBGAS Occult Blood Gastric / Duodenum, LAB696

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

1. Submit 0.5 mL of gastric aspirate fluid or vomitus in a screw-capped, sterile container.
2. Maintain sterility and forward promptly.
Note: Indicate specimen source on specimen container and in computer.

Reference Values

Negative

Day(s) Test Set Up

Monday through Sunday

Methodology

Specially Buffered Guaiac Test for Gastric Occult Blood.

Note: Many foods have peroxidase activity, which can produce a positive Gastroccult test result. 

Test Classification and CPT Coding

82271