Quick Facts
- Sample: Blood
- Fasting: No special preparation is required.
- Turnaround: 3-8 business days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures chromogranin A (CgA), a protein used as a tumor marker. Chromogranin A is measured directly from a blood sample and may help identify the presence of tumors that arise from neuroendocrine cells.
Your healthcare provider may use this measurement to support diagnosis, monitor how you respond to treatment, and check for tumor recurrence, particularly if you have symptoms such as flushing, diarrhea, or a rapid heart rate. This test measures one biomarker and does not evaluate other proteins, antigens, or molecular markers.
Benefits
- Measures chromogranin A, a protein linked to neuroendocrine tumors.
- Supports your provider's diagnostic workup alongside other clinical information.
- Helps track how your body responds to neuroendocrine tumor treatment.
- Assists in checking for neuroendocrine tumor recurrence over time.
- Requires only a standard blood draw with no special preparation.
- Provides results your provider can use alongside your symptoms and history.
Who Is This Test For?
- People experiencing symptoms such as flushing, diarrhea, or a rapid heart rate.
- People whose provider is evaluating a possible neuroendocrine tumor.
- People currently being treated for a neuroendocrine tumor.
- People whose provider is monitoring for neuroendocrine tumor recurrence.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test measures chromogranin A (CgA), a protein used as a tumor marker. Your healthcare provider may use this measurement to help evaluate the presence of tumors arising from neuroendocrine cells, support a diagnostic workup, monitor your response to treatment, and check for tumor recurrence. This test does not diagnose cancer on its own, and an abnormal result does not confirm that cancer is present.
2. Who should get this test, and when?
This test may be appropriate if you are experiencing symptoms such as flushing, diarrhea, or a rapid heart rate that your provider wants to evaluate further, if you are currently being treated for a neuroendocrine tumor and your provider wants to monitor your response, or if your provider is checking for tumor recurrence. Your provider can help determine whether this test fits your specific situation and when it should be ordered. This test does not replace a full clinical evaluation, and one result does not provide a complete picture on its own.
3. How does this test differ from other cancer-related tests?
This test measures a single biomarker, chromogranin A, and does not evaluate other proteins, antigens, or molecular markers. Not all cancer-related laboratory tests serve the same purpose, and this test's scope is limited to what a chromogranin A measurement can show your provider within the context described above.
4. Do I need to fast before this test?
No special preparation is required for this test.
5. How quickly will I get results?
Results are generally available in 3 to 8 business days. Turnaround may take longer based on weather, holidays, or other lab delays.
6. How do I interpret the results?
Interpreting your chromogranin A result depends on your specific result, your medical history, your symptoms, and other clinical findings your provider is considering. An abnormal result does not automatically mean cancer is present, and a normal result does not automatically rule cancer out. If your provider is monitoring you over time, changes in your chromogranin A level may provide useful context, but they do not guarantee a specific clinical conclusion on their own. Your provider may also consider this result alongside other laboratory findings or clinical evaluation.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
7. What should I do if my results are abnormal?
Review your results with a qualified healthcare provider, who may consider additional evaluation based on your symptoms, history, and overall clinical picture to determine appropriate next steps.
8. How often should I get tested?
How often you should be tested depends on your individual situation, including whether this test is being used to support diagnosis, monitor treatment, or check for recurrence. Follow your healthcare provider's guidance on testing frequency, as they can best determine what fits your circumstances.
Pre-test preparation
No special preparation is required for this test.
