8 hours
Test Updated:
RGAST
GASTRIN
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Test Overview
Chemiluminescent Assay
Diagnosis of Zollinger-Ellison syndrome and pernicious anemia, both of which bear relationship to high gastrin levels, evaluation of patients with severe duodenal ulcer, or recurrent symptoms after gastric surgery, evaluation of achlorhydria.
Fasting: 25-111 pg/ml
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Specimen Requirements
The patient should stop taking proton pump inhibitors (PPIs) (omeprazole-Prilosec; lansoprazole-Prevacid; rabeprazole-Aciphex; pantoprazole-Protonix; esomeprazole-Nexium, and Zegarid, a rapid release form of omeprazole) ONE WEEK prior to the blood draw. H2-receptor Blockers (i.e. cimetidine) should be stopped THREE DAYS prior to the blood draw. The patient should fast overnight, preferably 12 hrs or more; postprandial specimen should be indicated on the requisition. Collect specimen in an SST tube. Transport specimen to the laboratory on ice immediately after draw, or centrifuge, aliquot serum into a plastic vial and freeze within 1 hour of collection.
The patient should stop taking proton pump inhibitors (PPIs) (omeprazole-Prilosec; lansoprazole-Prevacid; rabeprazole-Aciphex; pantoprazole-Protonix; esomeprazole-Nexium, and Zegarid, a rapid release form of omeprazole) ONE WEEK prior to the blood draw. H2-receptor Blockers (i.e. cimetidine) should be stopped THREE DAYS prior to the blood draw. The patient should fast overnight, preferably 12 hrs or more; postprandial specimen should be indicated on the requisition. Collect specimen in SST tube; place on ice immediately after collection. Keep cold until ready to aliquot. Centrifuge, aliquot serum into a plastic vial and freeze within 1 hour of collection.
