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HelpTest Code GOB Occult Blood, Gastric Fluid
Additional Codes
St. Luke's Compendium Code (Iatric): L800.2375
Methodology
Peroxidase method for occult blood detection.
pH is also measured.
Specimen Requirements
Gastric Aspirate or vomitus submitted to the laboratory in a sterile container. Samples may be kept at room temperature for 24 hours, or refrigerated for 5 days.
Reference Values
Not established.
This test will reliably detect hemoglobin levels equal to or greater than 59 mcg/mL in gastric fluid at pH 1-9. This is equivalent to 30-50 mcL of blood per dL of gastric fluid based on the hemoglobin content in blood of normal adults.
It is unlikely that there will be inhibition of the occult blood test by antacids if gastric samples are tested no sooner than 60 minutes after the last antacid administration and following stomach irrigation.
Day(s) Test Set Up
Monday-Sunday
Test Classification and CPT Coding
83986-pH
82271-Occult blood