Test Code

Quest Code

Alias/See Also

CPT Codes

Preferred Specimen
1 mL frozen serum

Patient Preparation
Overnight fasting is required, preferably 12 hours or more.
Dietary supplements containing biotin may interfere in assays and may skew analyte results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.

Minimum Volume
0.5 mL

Keep on ice/refrigerated after collection. Centrifuge, separate and freeze serum for transport to QNI for testing. 

Transport Temperature

Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Received thawed • Grossly icteric

Immunoassay (IA)

Setup Schedule
A.M. Sets up 3 days a week.

Reference Range
Reference range applies to fasting specimen only
<5 years Not established
5-17 years <65 pg/mL
≥18 years ≤100 pg/mL

Clinical Significance
For the diagnosis and monitoring of gastrin-secreting tumors, gastric ulcer, Zollinger-Ellison syndrome. Increased in pernicious anemia.

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.