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Chromogranin A, Serum

CgA

Test Codes

EPIC: LAB2503, Beaker: CHROMO, MAYO: CGAK

Department

Send Outs

Instructions

Proton pump inhibitor medications should be discontinued for at least 2 weeks before collection.

Specimen Collection Criteria

Collect (preferred specimen): One Gold-top SST tube.
Also acceptable: One plain Red-top tube.

Physician Office/Draw Specimen Preparation

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and freeze (-20°C/-4°F or below).

Preparation for Courier Transport

Transport: 0.5 mL serum, frozen (-20°C/-4°F or below). (Minimum: 0.2 mL)

Rejection Criteria

• Specimens not collected and processed as indicated.
• Grossly hemolyzed.

In-Lab Processing

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and freeze (-20°C/-4°F or below).

Transport: 5.0 mL serum, frozen (-20°C/-4°F or below). (Minimum: 0.5 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 48 hours
Refrigerated (2-8°C or 36-46°F): 48 hours
Frozen (-20°C/-4°F or below): 90 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Mayo Clinic Laboratories in Rochester, MN.

Performed

Monday – Friday.
Results available in 2-4 days.

Reference Range

By report.

Test Methodology

Immunofluorescent Assay (IFA).

Clinical Utility

This assay is used in the management of patients with neuroendocrine tumors such as neuroblastoma, pheochromocytoma, carcinoid tumors, and small cell lung carcinoma.

Results obtained with different assay methods or kits cannot be used interchangeably.

CPT Codes

86316
LOINC:  9811-1

Contacts

Last Updated

10/18/2024