Metanephrine-Free Plasma Test
About Metanephrine-Free Plasma Test
| Field | Value |
|---|---|
| Also Known As | Plasma Free Metanephrines Test, Fractionated Plasma Free Metanephrines Test, Plasma Metanephrines Test |
| Sample Type | Venous blood (EDTA plasma) |
| Fasting Required | Yes – overnight fast of 8 to 12 hours; avoid caffeine, alcohol, and tobacco |
| Report Time | 5 to 12 days |
| Recommended For | Adults and children of all ages; no gender restriction |
| Price | Starting at ₹2400 |
What Is a Metanephrine-Free Plasma Test?
The metanephrine-free plasma test measures two specific breakdown products of stress hormones in the blood: free metanephrine and free normetanephrine. Doctors order it when they suspect a rare type of adrenal tumour that releases excessive stress hormones into the body. A small blood sample drawn from a vein in the arm is used for the analysis. The test is also called the plasma metanephrines test or the fractionated plasma free metanephrines test.
What Does a Metanephrine-Free Plasma Test Measure?
The plasma metanephrines test checks the levels of two specific metabolites (breakdown products) of adrenal hormones in the blood. Because these metabolites stay in the bloodstream longer than the hormones themselves, they give a more reliable picture of adrenal activity. The two parameters measured are listed below.
| Parameter | What It Is |
|---|---|
| Metanephrine (free) | A breakdown product of epinephrine (adrenaline), a hormone released during stress |
| Normetanephrine (free) | A breakdown product of norepinephrine (noradrenaline), a hormone involved in the body's fight-or-flight response |
Why Is a Metanephrine-Free Plasma Test Done?
This test is ordered when a doctor suspects a tumour that releases excess adrenal hormones. It is also used to monitor patients who have previously been treated for such a tumour.
Common Symptoms That May Require This Test
The following symptoms are among the most common reasons a doctor may recommend the fractionated plasma free metanephrines test:
- Palpitations (a racing or pounding heartbeat)
- Excessive sweating without a clear cause
- Severe or recurring headaches
- High blood pressure that does not respond to standard treatment
- Rapid heart rate
- Anxiety or unexplained feelings of panic
- Flushing or tremors
Conditions This Test Can Help Detect
The plasma metanephrines test can help identify the following conditions:
- Pheochromocytoma, a rare tumour of the adrenal gland that releases large amounts of stress hormones, causing episodes of high blood pressure, headaches, and sweating
- Paraganglioma, a similar tumour that develops outside the adrenal gland, often along nerves or arteries
- Neuroblastoma, a tumour arising from nerve tissue, more often seen in children
- Incidentally found adrenal masses (lumps on the adrenal gland discovered during imaging for another reason)
Metanephrine-Free Plasma Test for Chronic Disease Monitoring
When a catecholamine-secreting tumour has been surgically removed or treated, levels of metanephrines in the blood should return to normal. Regular testing helps doctors confirm that treatment was successful. If levels rise again during follow-up, it may indicate that the tumour has returned, prompting further investigation.
How to Prepare and What to Expect
Proper preparation is important for this test, as several everyday factors can affect the results. Following these steps will help ensure an accurate reading.
Do You Need to Fast?
Yes, fasting is required. You should not eat or drink anything except water for 8 to 12 hours before your blood is collected. Avoid tea, coffee, colas, alcohol, and tobacco during this time, as these can raise hormone levels and affect the outcome.
Practical Tips Before Your Test
The steps below will help you prepare for your metanephrine-free plasma test correctly.
- Avoid caffeine, alcohol, tobacco, and strenuous exercise before the test
- Rest quietly for at least 20 to 30 minutes before sample collection, ideally in a lying-down position
- Avoid emotional stress or physical exertion on the day of the test
- Inform the phlebotomist and your doctor about all medications you are taking, including over-the-counter drugs
- Do not stop any prescribed medication without your doctor's instruction
Step-by-Step Procedure
Here is what typically happens during a metanephrine-free plasma test collection.
- You rest in a lying-down (supine) position for at least 15 to 20 minutes before blood is drawn. This step is important to avoid posture-related changes in hormone levels.
- A trained phlebotomist cleans a small area on your arm with an antiseptic.
- A needle is gently inserted into a vein to collect a blood sample. The process takes only a few seconds.
- After collection, the sample is processed within two hours: it is spun in a centrifuge to separate the plasma, which is then transferred into a sealed vial.
- The vial is refrigerated and transported to the laboratory for analysis.
- Your report is generated and shared with you within the stipulated turnaround time.
Factors That Can Affect Accuracy
Several factors can cause artificially high or misleading results. Be aware of the following:
- Caffeine, alcohol, or tobacco consumed before the test
- Physical activity, emotional stress, or anxiety around the time of collection
- Certain medications, including beta-blockers, tricyclic antidepressants, amphetamines, and monoamine oxidase inhibitors (MAOIs)
- Not resting in a lying-down position before the blood draw
- Use of an adrenaline auto-injector (such as an Epi-pen) recently
- Withdrawal from sedative substances such as alcohol, benzodiazepines, or opioids
Understanding Your Metanephrine-Free Plasma Test Results
Your results should always be reviewed with a qualified doctor who can place them in the context of your symptoms, medical history, and any other tests. The reference ranges below are a general guide.
| Parameter | Normal Range | Unit |
|---|---|---|
| Metanephrine, free | Less than 0.50 | nmol/L |
| Normetanephrine, free | Less than 0.90 | nmol/L |
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
Certain health conditions can affect how results are interpreted. Your doctor will take the following into account.
- Patients with chronic kidney disease, particularly those with a glomerular filtration rate (a measure of kidney function) below 30 mL/min, may have mildly elevated plasma metanephrine levels. The plasma test is still preferred over urine testing in this group, as free plasma metanephrine levels are less affected by kidney function than other measurement methods.
- Certain medications that increase the body's own stress hormone levels, including MAOIs (a class of antidepressants), cocaine, and drugs associated with withdrawal effects, may cause borderline elevations. Your doctor will factor in your medication history when interpreting your results.
How to Maintain Healthy Levels
The following general wellness habits support overall adrenal health.
- Practise stress management techniques such as meditation, deep breathing, or yoga
- Eat a balanced diet and stay physically active in a way that suits your fitness level
- Attend regular medical check-ups, particularly if you have a family history of adrenal tumours or related genetic conditions
Lupin Diagnostics Metanephrine-Free Plasma Test Price and Home Collection
The metanephrine-free plasma test price starts at approximately ₹2400, with home sample collection available across major cities. Prices vary by location, as shown in the table below.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹2400 |
| Bengaluru | ₹2400 |
| Chennai | ₹2400 |
| Hyderabad | ₹2400 |
| Kolkata | ₹2400 |
| Pune | ₹2400 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Booking your metanephrine-free plasma test through Lupin Diagnostics is straightforward.
- 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
Home collection for the plasma metanephrines test is available across cities. A certified phlebotomist visits your home at your chosen time and follows the correct collection protocol, including ensuring you have rested in a lying-down position before the draw. All samples are processed in NABL-accredited laboratories, and your digital report is delivered directly to your email or WhatsApp.
Frequently Asked Questions
The metanephrine-free plasma test is used to screen for rare tumours, called pheochromocytomas and paragangliomas, that release excess stress hormones into the bloodstream. It is also used to monitor patients after treatment for these tumours to check whether they have returned.
Sitting upright increases the release of stress hormones, which can raise plasma metanephrine levels and produce a falsely abnormal result. Resting in a lying-down position for at least 15 to 20 minutes before sample collection helps keep results accurate and reduces unnecessary follow-up testing.
Yes, several medications can interfere with this test, including certain antidepressants, beta-blockers, and amphetamines. Ideally, any interfering drugs should be stopped at least 72 hours before the test, but only if your doctor considers this safe. Never stop a prescribed medicine without medical guidance.
A mildly elevated result does not automatically confirm a tumour. Your doctor may recommend a repeat test or a 24-hour urine metanephrines test to confirm the finding before considering any imaging. Factors such as stress, caffeine, or medications can cause borderline elevations.
The plasma metanephrines test is actually the preferred option for people with chronic kidney disease because free plasma metanephrine levels are not significantly affected by kidney function. Your doctor may apply slightly adjusted reference ranges based on your specific kidney function results.
The combined measurement of free plasma metanephrines shows very high sensitivity for detecting pheochromocytoma, meaning a normal result makes the condition very unlikely. Significantly elevated results (three times or more above the upper limit) are rarely due to other causes and usually prompt imaging to locate the tumour.
Yes, home collection is available in major cities across India through Lupin Diagnostics. The phlebotomist will follow the recommended protocol of ensuring you rest in a lying-down position before the draw and will handle sample refrigeration appropriately to maintain accuracy.
Metanephrine-Free Plasma Test
