Chromogranin A

Alphabetical Test listing

Chromogranin A-8045

Test name:

Chromogranin A

Test number:

8045

Excellian order number:

LAB8045

Abbreviation:

CGA

Useful for:

Useful in the diagnosis of carcinoid tumors
An adjunct in the diagnosis of other neuroendocrine tumors, including pheochromocytomas, medullary thyroid carcinomas, functioning and nonfunctioning islet cell and gastrointestinal amine precursor uptake and decarboxylation tumors, and pituitary adenomas

Patient preparation information:

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

Specimen type:

Serum

Collection container:

Gold serum separator (SST) tube

Volume:

0.5 mL

Minimum volume:

0.2 mL

Collection instructions:

Immediately following collection, mix sample by gently inverting 5 times

Processing instructions:

Allow sample to clot for a minimum of 30 minutes
Spin within two (2) hours of sample collection
Transfer serum to a Screw cap transfer vial/tube (Mayo T914), labelled as serum
Freeze

Transport container:

Screw cap transfer vial/tube (Mayo T914)

Alternate collection container:

Red serum vial/tube, 5 mL

Alternate processing instructions:

Allow sample to clot
Spin within two (2) hours of sample collection
Transfer serum to a Screw cap transfer vial/tube (Mayo T914), labelled as serum
Freeze

Transport and stability:

Frozen (preferred) - 90 days

Ambient - 48 hours

Refrigerated - 48 hours

Reason for rejection:

Hemolysis

Performing lab:

Mayo Clinic Laboratories (CGAK): R-MM

Days set up:

Mo - Sa

TAT:

1 - 3 days

Method:

Immunofluorescent Assay (IFA)

Reference ranges:

< 93 ng/mL

CPT codes:

86316

Subject to medical necessity (Y/N):

Yes

LCD/NCD:

Medical necessity

Date created:

11/07/2007

Revised date:

04/10/2024

Review date:

01/04/2024