Chromogranin A blood test
Quick answer: This test measures chromogranin A, a protein released by neuroendocrine cells. Doctors use it to help diagnose and follow neuroendocrine tumours.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed; tell your doctor if you take acid-reducing medicines, as they can raise the level.
How the test is done
- 1You may be asked to fast before the test
- 2Tell your doctor about stomach acid medicines you take
- 3A needle draws blood from a vein
- 4The lab measures chromogranin A
What your results can mean
Reading your report
Normal ranges differ between labs and by age and sex, so discuss your result with your doctor.
If the result is outside the usual range
A high level can be seen with neuroendocrine tumours, but also with kidney problems, some heart conditions and acid-reducing medicines. Changes over time help track tumour activity.
Who usually has this test
People with suspected or known neuroendocrine tumours, including those being followed after treatment.
Risks and aftercare
Bruising is possible but usually minor.
Names and options
Also called: CgA, chromogranin
Listed by the hospital as
- CHROMOGRANIN A, EDTA PLASMA
Questions about this test
Can acid-reducing medicines affect chromogranin A?
Yes. Proton pump inhibitors, such as omeprazole, can raise the level. Tell your doctor if you take them, but do not stop without advice.
Is chromogranin A a diagnosis on its own?
No. It supports the diagnosis of a neuroendocrine tumour but is read with scans and other tests.
Why is chromogranin A repeated over time?
A rising or falling level can help show whether a known tumour is growing or responding to treatment.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.