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Test Code OBLGAS Occult Blood, Gastric LAB696

Test Method

Oxidation, Gastroccult; Beckman

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.

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.)

Performance

Testing is performed Monday through Sunday.

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

Useful For

Screening for gastrointestinal bleeding

LOINC Code Information

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

CPT Code Information

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