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Chromogranin A

Chromogranin A

Chromogranin A (CgA) is a protein produced by neuroendocrine cells, which are cells that release hormones in response to signals from the nervous system. The CgA test measures the amount of this protein in the blood, and it can be used as a tumor marker for neuroendocrine tumors, including carcinoids, pancreatic endocrine tumors, and pituitary tumors.


  • Test NameChromogranin A
  • Sample TypeBlood
  • Preparations RequiredThere are no specific instructions. However, certain medications can affect the test results, so make sure your doctor is aware of any drugs you're currently taking
  • Report Time24 hours

What is Chromogranin A?

Chromogranin A is a protein produced by nerve cells and certain endocrine (hormone-producing) cells. It is often elevated in certain types of tumors.

Why would I need a Chromogranin A test?

A Chromogranin A test is typically ordered when a doctor suspects a patient may have a neuroendocrine tumor. It can also be used to monitor the effectiveness of treatment for these tumors.

Home Sample Collection Process

1
Book your convenient slot
Book your convenient slot
2
Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
3
Reporting of the sample at lab
Reporting of the sample at lab
4
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Frequently Asked Questions

This test requires a blood sample, which will be drawn by a healthcare professional from a vein in your arm.

You should get this test if you have symptoms suggestive of a neuroendocrine tumor, such as flushing, diarrhea, wheezing, or unexplained weight loss.

Elevated levels of Chromogranin A in your blood can suggest the presence of a neuroendocrine tumor. However, a positive result does not confirm the diagnosis and further investigations may be needed.

There are very minimal risks associated with a blood test. These might include slight pain or bruising at the site where the needle was inserted.

No special preparation is required for this test. However, certain drugs can affect the test results, so you should tell your doctor about any medications you are taking.

Yes, certain medications, stress, and existing health conditions can influence your test results. It's important to discuss these factors with your doctor.

If your Chromogranin A levels are high, you should consult a specialist, typically an endocrinologist or oncologist, for further evaluation.

Treatment depends on the underlying cause. If a neuroendocrine tumor is present, treatment options may include surgery, radiation therapy, chemotherapy, or other medications to control symptoms.

No, fasting is not typically required for this test.

Normal values can vary between laboratories, so it is important to discuss your specific results with your doctor.

The frequency of testing depends on your individual circumstances, including the reason for testing and your overall health.

There are no specific precautions to take after the test. However, if your levels are high, you will need to follow up with your doctor for further evaluation and treatment.

Modifiable factors might include lifestyle changes or altering the use of certain medications. Nonmodifiable factors could include age and genetic predisposition.

Side effects are typically minimal and might include slight pain or bruising at the site where the needle was inserted.

Yes, pregnant women can have a Chromogranin A test. However, pregnancy can influence test results, so it's important to inform your doctor if you are pregnant.

Low Chromogranin A levels are typically not a cause for concern. However, if you have symptoms of a neuroendocrine tumor, other tests may be needed.

Certain medications, such as proton pump inhibitors, can affect Chromogranin A levels. It's important to tell your doctor about any medications you are taking.

No, this test cannot be done at home. It requires a blood draw, which should be done by a healthcare professional.

Understanding your Chromogranin A levels can help your doctor detect and monitor neuroendocrine tumors. If you have symptoms suggestive of these types of tumors, or if you're receiving treatment for one, this test can provide vital information about your health. Always consult with your doctor for the best advice and medical care.

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