Test Overview
Test Methodology
Immunofluorescent Assay (IFA)
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.
Normal Volume
0.5 mL serum
Minimum Volume
0.2 mL serum
Storage Temperature
Frozen preferred (ambient or refrigerated only good 48 hrs)
Additional Information
Test sent to Mayo Clinic Laboratories.
Billing
CPT Code
86316
Fee Code
20491
LOINC
30169-7