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Test Code CGAK Chromogranin A, Serum

Additional Codes

Epic Ordering Code LAB3010
NBS code LBC00234
Service code 36626

Reporting Name

Chromogranin A, S

Specimen Type

Serum


Specimen Required


Patient Preparation: For at least 2 weeks before specimen collection, patient should stop taking proton pump inhibitor medications.

Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Information: Centrifuge and aliquot serum into plastic vial. Do not submit in original tube.


National University Hospital-Singapore Note:

NUH Outreach Laboratories:
Specimen Requirements
Submit only one of the following:
Preferred: Yellow Top
Acceptable: Red Top
Patient Preparation: For at least 2 weeks before specimen collection, patient should stop taking proton pump inhibitor medications.
Processing Requirements
Centrifuge and aliquot serum into a plastic vial. Do not submit in original tube.
Specimen type: Serum
Volume: 0.5 mL
Storage/transport requirements: Frozen

Forms

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

-General Request (T239)

-Oncology Test Request (T729)

Specimen Minimum Volume

0.2 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 90 days
  Ambient  48 hours
  Refrigerated  48 hours

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross icterus OK

Method Name

Immunofluorescent Assay (IFA)

Day(s) Performed

Monday through Saturday

Report Available

1 to 3 days
National University Hospital-Singapore Note:

Please note that this is a referral test requiring transport to the external testing facility and an additional 3-5 days is required.

Reference Values

<93 ng/mL

Reference values apply to all ages.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Aiding in monitoring disease progression during the course of disease and treatment in patients with gastroenteropancreatic neuroendocrine tumors (grade 1 and grade 2) when used in conjunction with other clinical methods

 

This test is not indicated for use as a stand-alone monitoring assay.

CPT Code Information

86316

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

Secondary ID

34641

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.
National University Hospital-Singapore Additional Information:

Last updated 14/07/2026