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Test Code 317 Occult Blood, Gastric

Additional Codes


PowerChart: Occult Blood Gastric Fluid


Specimen Requirement

0.5 mL gastric aspirate is required.

Additional Specimen Collection Information

Collect a gastric aspirate specimen by nasogastric intubation or vomitus in a sterile container. Label the specimen appropriately with two identifiers, patient name and another identifier, (patient ID number, DOB, etc.) include specimen source, date and time of collection. Transport the specimen to the laboratory immediately upon collection.

Useful For

Screening for gastrointestinal bleeding


Testing is performed Monday through Sunday.

Typically completed within 4 hours after the specimen arrives at the testing site.

CPT Code Information

82274 Chemistry: Occult Blood, by fecal hemoglobin determination by immunoassay, qualitative, feces, 1-3 simultaneous determinations.

LOINC Code Information

24337-8 Hemoglobin.Gastrointestinal [Presence] In Gastric Fluid

Test Method

Oxidation, Gastroccult; Beckman

Reference Values

Occult Blood: Negative

pH: 1.0 - 4.0

(Expected value in normal subjects afer 12 hour fast and in absence of smoking or chewing gum.)