Test Overview
Test Methodology

Homogeneous Time-Resolved Fluorescence

Test Usage

Follow-up or surveillance or to aid in the diagnosis of carcinoid tumors. To aid in the diagnosis of other neuroendocrine tumors, including pheochromocytomas, medullary thyroid carcinomas (MTC), functioning and nonfunctioning islet cell and gastrointestinal amine precursor uptake and decarboxylation (APUD) tumors, and pituitary adenomas.

Reference Range *

< 93 ng/mL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Saturday
Analytic Time

1 - 3 days

Soft Order Code
CGAK
MiChart Code
CGAK
Synonyms
  • CHROMOA
  • Chromogranin A
  • CGAK
  • Chromogranin A, Serum
Laboratory
Sendout
Reference Laboratory
Mayo CGAK (34641)
Section
Special Testing
Specimen Requirements
Collection Instructions

Proton pump inhibitor drugs should be discontinued for at least 2 weeks prior to specimen collection. Collect specimen in a red top or SST tube. Centrifuge, aliquot serum into a plastic vial and freeze.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.2 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
86316
Fee Code
20491
LOINC
30169-7
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