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Epic Test Code LAB696 Gastric Occult Blood


Specimen is tested for the presence of blood using Gastroccult slide

Specimen Type

Gastric Contents, vomitis or nasogastric

Preferred Container

Sterile Container

Alternate Container

Random Urine Tube

Volume Required

1 mL

Storage Requirements

Refrigerate up to 5 days is analysis will be delayed

Transportation Needs

Deliver to laboratory immediately

Causes for Rejection

Mislabeled or unlabeled specimen

Insufficient quantitiy

Grossly bloody

> 24 hours at Room Temperature

> 5 days Refrigerated


Days of Analysis


Additional Information

Patient Preparation:

Patient should avoid antacids at least 1 hour before specimen is collected and abstain from taking vitamin C for 3 days prior to testing.

Available STAT



Guaiac and hydrogen peroxide

Reference Values

Population Units Reference Range
All Populations none Negative


CPT Code


Last Updated


Minimum Volume

0.5 mL

LIS Code



Results can only be regarded as preliminary screening or as an aid to diagnosis and cannot be considered conclusive evidence of the presence or absence of upper gastrointestinal bleeding or pathology.  Many foods contain peroxidase activity which can produce a positive result.