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GAST / GAST-M
GASTRIN, SERUM

Test Code GAST / GAST-M 
Test GASTRIN, SERUM 
Methodology Automated Chemiluminescent Immunometric Assay 
Description Useful for diagnosis of gastrinoma and Zollinger-Ellison syndrome 
Specimen Draw blood in either a plain, red-top tube or serum gel tube from a fasting patient (8 hours). Spin down and send 1.0 mL (minimum: 0.5 mL) of serum refrigerator in a plastic vial. Must be received within 24 hours, if not, send frozen.

NOTE:
1. If multiple specimens are collected, send separate request form for each specimen.
2. Label specimens appropriately (corresponding collection time). 

Reference Values <= 100 pg/mL
There is no evidence that fasting serum gastrin levels differ between adults and children. Although 8-hour fasts are difficult or impossible to enforce in small children, serum gastrin levels after shorter fasting periods (3-8 hours) may be 50-60% higher than the 8-hour fasting value. 
Analytic Time 2 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 82941  Each