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Test Code LAB80 Gastrin, Serum

Additional Codes

Mayo Test Code: GAST

Reporting Name

Gastrin, S

Useful For

Investigation of patients with achlorhydria or pernicious anemia


Investigation of patients suspected of having Zollinger-Ellison syndrome


Diagnosis of gastrinoma; basal and secretin-stimulated serum gastrin measurements are the best laboratory tests for gastrinoma

Method Name

Automated Chemiluminescent Immunometric Assay

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Patient Preparation:

1. Fasting (8 hours) required

2. 12 hours before this blood test do not take multivitamins or dietary supplements containing biotin or vitamin B7, which are commonly found in hair, skin, and nail supplements and multivitamins.


Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. If multiple specimens are drawn, submit each vial under a separate order.

2. Label specimens with corresponding draw time.

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 30 days
  Refrigerated  24 hours

Reject Due To


Mild OK; Gross reject


Mild OK; Gross OK




Nonfasting specimens


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% to 60% higher than the 8-hour fasting value.

Day(s) and Time(s) Performed

Monday through Friday; 5 a.m.-12 a.m.

Saturday; 6 a.m.-6 p.m.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
GAST Gastrin, S 2333-3


Result ID Test Result Name Result LOINC Value
GAST Gastrin, S 2333-3

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.


If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

Oncology Test Request Form (T729) (

Benign Hematology Test Request Form (T755) (