Chromogranin A Test
About Chromogranin A Test
| Field | Value |
|---|---|
| Also Known As | CgA Test, Serum Chromogranin A Test, Plasma Chromogranin A Test |
| Sample Type | Venous blood (serum or plasma) |
| Fasting Required | Yes – overnight fasting recommended |
| Report Time | 3 to 6 days |
| Recommended For | Adults of all ages, male and female |
| Price | Starting at ₹5,400 |
What Is a Chromogranin A Test?
The Chromogranin A test measures the level of a protein called Chromogranin A (CgA) in the blood. CgA is produced and released by specialised cells, called neuroendocrine cells, which are found in many organs across the body.
What Does a Chromogranin A Test Measure?
This test measures the concentration of Chromogranin A in your blood stream. Neuroendocrine cells release CgA along with hormones. When these cells become cancerous or form tumours (known as neuroendocrine tumours or NETs), they often release significantly higher amounts of CgA into the blood. Therefore, measuring CgA levels acts as a valuable tool for tracking these specific conditions.
Why Is a Chromogranin A Test Done?
Doctors order this test primarily as a tumour marker, meaning it helps detect or monitor certain tumours of the neuroendocrine system. It is used alongside other diagnostic imaging and blood tests to construct a complete clinical picture.
Common Symptoms That May Require This Test
Your healthcare provider might request a CgA test if you exhibit symptoms linked to neuroendocrine tumours, which frequently release excess hormones. These symptoms depend on where the tumour is located and can include:
- Flushing (sudden redness and warmth in the face and neck)
- Persistent diarrhoea or abdominal cramps
- Rapid heart rate or heart palpitations
- Unexplained weight loss or weight gain
- Wheezing or sudden breathing difficulties
- High blood pressure that is difficult to manage
Conditions This Test Can Help Detect
The CgA test is particularly instrumental in identifying and managing several rare types of neuroendocrine tumours, including:
- Carcinoid Tumours (commonly found in the gastrointestinal tract or lungs)
- Pheochromocytomas (tumours of the adrenal glands)
- Neuroblastomas (cancer arising from immature nerve cells, more common in children)
- Other pancreatic neuroendocrine tumours (like insulinomas or gastrinomas)
Chromogranin A Test for Chronic Disease Monitoring
For individuals already diagnosed with a neuroendocrine tumour, the CgA test serves as an essential tool for chronic disease monitoring. Doctors use regular testing to evaluate if a tumour is growing, remaining stable, or shrinking in response to treatments like surgery, chemotherapy, or targeted therapies.
How to Prepare and What to Expect
Understanding the preparation required for your Chromogranin A test ensures accurate results and a smooth procedure.
Do You Need to Fast?
Yes, overnight fasting (typically 8 to 12 hours) is strongly recommended before this test. You can drink water, but avoid eating or consuming beverages like tea, coffee, or juice prior to sample collection.
Practical Tips Before Your Test
- Medication Review: Inform your doctor about all prescription drugs, over-the-counter medications, and supplements you are taking. Certain common medications can significantly elevate CgA levels.
- Stay Hydrated: Drinking water during your fasting period makes drawing blood easier.
- Wear Comfortable Clothing: Opt for a short-sleeved shirt or clothing with sleeves that can easily be rolled up.
Step-by-Step Procedure
The Chromogranin A test is a routine blood test performed quickly and safely:
- A phlebotomist or nurse will ask you to sit comfortably and identify a suitable vein, usually on the inside of your elbow.
- The skin over the vein is cleaned with an antiseptic wipe.
- A tourniquet (elastic band) is tied around your upper arm to increase blood flow and make the vein more visible.
- A sterile needle is gently inserted into the vein to collect a small volume of blood into a collection tube.
- The needle is removed, and a small bandage or gauze is applied to the puncture site to stop any minor bleeding.
Factors That Can Affect Accuracy
Several things can influence your CgA reading:
- Eating a meal before the test (CgA can rise 2 to 3 times above normal within 30 to 90 minutes of eating)
- Strenuous physical activity or high stress levels
- Proton pump inhibitor (PPI) use
- Reduced kidney or liver function
- Pregnancy
- The laboratory method used, as CgA is not yet standardised across all labs
Understanding Your Chromogranin A Test Results
Results from a Serum Chromogranin A test should always be reviewed by a qualified doctor alongside your symptoms, medical history, and other test findings.
| Parameter | Normal Range | Unit |
|---|---|---|
| Chromogranin A (CgA) | Less than 93 | ng/mL |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Several conditions unrelated to tumours can affect your CgA reading:
- PPI use: Long-term use of acid-suppressing PPI medicines causes an abnormal increase in certain stomach cells, which raises CgA levels significantly
- Kidney or liver failure: Impaired kidney or liver function can cause CgA to accumulate in the blood, producing a higher reading
- Heart conditions: Heart failure, high blood pressure, and atherosclerosis (narrowing of arteries) are all associated with raised CgA levels
- Autoimmune conditions: Diseases such as rheumatoid arthritis, Crohn's disease, type 1 diabetes, and lupus can also affect CgA levels
- Pregnancy and exercise: Both can cause a temporary rise in circulating CgA
How to Maintain Healthy Levels
The following general wellness habits support overall neuroendocrine health:
- Attend all scheduled follow-up appointments and repeat tests at the same laboratory using the same method, so that results can be reliably compared over time
- Keep your doctor informed about all medicines you take, particularly antacids and PPIs
- Maintain a balanced diet, stay hydrated, and manage stress through regular rest and light physical activity
Lupin Diagnostics Chromogranin A Test Price and Home Collection
The Chromogranin A test is available at Lupin Diagnostics with home sample collection, starting at approximately ₹5,400 depending on your city.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹5,400 |
| Bangalore | ₹5,400 |
| Chennai | ₹5,400 |
| Hyderabad | ₹5,400 |
| Kolkata | ₹5,400 |
| Bhopal | ₹5,400 |
| Pune | ₹5,400 |
| Indore | ₹5,400 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website
- Choose your city and preferred time slot
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre
- Receive your report via email or WhatsApp within the stipulated turnaround time
Home Collection
Lupin Diagnostics offers home sample collection for the CgA test across multiple cities in India. All samples are processed in NABL-accredited laboratories by trained professionals. Your digital report is delivered securely via email or WhatsApp.
Frequently Asked Questions
The Chromogranin A test is primarily used to monitor the effectiveness of treatment in patients with neuroendocrine tumours (NETs). It may also support the diagnostic process when NETs are suspected and help doctors assess a patient's outlook. Doctors use it alongside other tests and clinical findings, not as a standalone diagnosis.
Yes, overnight fasting is recommended before the Chromogranin A blood test. You may drink plain water during this period.
Yes, medications that reduce stomach acid, especially Proton Pump Inhibitors (PPIs) like omeprazole or pantoprazole, can cause false elevations in CgA levels. Always discuss your medications with your doctor before testing.
Non-cancerous conditions such as chronic kidney disease, liver disease, gastritis, and inflammatory bowel disease (IBD) can also lead to elevated Chromogranin A levels.
Not definitively. Some neuroendocrine tumours do not secrete Chromogranin A. If clinical suspicion remains high, your doctor will look at other imaging modalities and laboratory assessments.
The CgA test is not yet standardised uniformly across laboratories. Different methods can produce different numerical results, making it difficult to compare readings taken at different labs. Using the same laboratory and method each time ensures that changes in your CgA level can be tracked accurately over time.
For patients with gastroenteropancreatic neuroendocrine tumours, the Chromogranin A test is typically repeated at routine monitoring visits, usually every 3 to 6 months. Your doctor will determine the appropriate schedule based on your individual condition and treatment plan.
Chromogranin A Test
