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Test Code CGAM Chromogranin A, Serum

Additional Codes







Reporting Name

Chromogranin A, S

Useful For

Follow-up or surveillance of patients with known or treated carcinoid tumors


An adjunct 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


A possible adjunct in outcome prediction and follow-up in advanced prostate cancer

Method Name

Immunofluorescent Assay

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Patient Preparation: Proton pump inhibitor drugs should be discontinued for at least 2 weeks before collection.

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic screw-top aliquot tube

Specimen Volume: 0.5 mL

Collection Information: Spin down and remove serum from clot. Do not submit in original tube.

Specimen Minimum Volume

0.2 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen 365 days

Reject Due To


Mild OK; Gross reject


Mild OK; Gross OK


Mild OK; Gross OK


Original collection tube: serum not poured off into an aliquot tube

Reference Values

<93 ng/mL

Reference values apply to all ages.

Day(s) and Time(s) Performed

Monday through Friday; 2:30 p.m.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
CGAK Chromogranin A, S 9811-1


Result ID Test Result Name Result LOINC Value
CGAK Chromogranin A, S 9811-1


If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

General Request Form (T239) (

Oncology Test Request Form (T729) (

Analytic Time

Same day/1 day

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.