Gastric Occult Blood 
Mnemonic GASTROCLT
CPT 82273, 83986 (pH Reading)
Test Code 6800134
Synonyms Gastroccult
Test Includes Guaiac test for occult blood and pH test of gastric specimens
Specimen Gastric Aspirate or Vomitus
Volume 3.0 mL
Container Sterile Container
Special Instructions Have patient avoid Vitamin C, antacids containing Magnesium Hydroxide (Mylanta II or Malox Plus) or substances containing high concentration of iron or copper salts. Foods such as raw fruits, vegetables, and incompletely cooked meat should also be avoided.
Specimen Prep  
Storage Room Temperature
Transport Temp Room Temperature
Stability Rm Temp 24 hours
Stability Refrig Unacceptable
Stability Frozen Unacceptable
Methodology Guaiac test for occult blood
Rejection Criteria Inadequate specimen, delay in transport 
Reference Value Negative 
Performed/TAT Monday - Sunday   24 hours    
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