Specimen Required

1 mL serum from Gold SST or Plain Red tube. Centrifuge at refrigerated temperature within 2 hours of collection and immediately aliquot serum into plastic vial.

Patient Preparation:

1. Fasting (8 hours) required.
2. For 12 hours before specimen collection, don't take multivitamins or dietary supplements containing biotin (vitamin B7).
3. If medically feasible, proton pump inhibitor (omeprazole, lansopraxole, dexlansoprazole, esomeprazole, pantoprazole and rabeprazole) therapy should be discontinued 1 week before measurement of gastrin levels.
4. Drugs that interfere with gastrointestinal motility (eg opioids) should be discontinued for at least 2 weeks before serum gastrin testing.