Normetanephrines, Free-Plasma Test: Booking, Price, and Results
About Normetanephrines, Free-Plasma Test
| Field | Value |
|---|---|
| Also Known As | Normetanephrines Plasma Assay, Free NMN Plasma Test |
| Sample Type | Venous blood |
| Fasting Required | Yes, overnight fasting of 8 to 12 hours preferred |
| Report Time | 5 to 7 working days |
| Recommended For | Adults and children of all ages; males and females |
| Price | Starting at ₹4,500 |
What Is a Normetanephrines, Free-Plasma Test?
The normetanephrines free plasma test measures the level of normetanephrine in your blood. Normetanephrine is a stable breakdown product of norepinephrine (also called noradrenaline), a hormone that controls heart rate and blood pressure. Doctors order this test when they suspect a tumour that produces excess stress hormones. Blood is drawn from a vein, and the plasma is analysed using a specialised laboratory method.
This test is also called the normetanephrine plasma assay or free NMN plasma test, and it is often measured alongside metanephrine to give a fuller picture of adrenal hormone activity.
What Does a Normetanephrines, Free-Plasma Test Measure?
The normetanephrine plasma assay looks at a specific hormone metabolite that the body produces continuously. Unlike the hormones themselves, this metabolite remains at a steadier level in the blood, making it a reliable marker for detecting tumours that secrete stress hormones.
The test measures the following:
| Component | What It Measures |
|---|---|
| Normetanephrine (Free Plasma) | The breakdown product of norepinephrine. Elevated levels can point to a tumour in or near the adrenal glands that is releasing excess norepinephrine into the body. |
Why Is a Normetanephrines, Free-Plasma Test Done?
The free NMN plasma test is ordered when a doctor needs to investigate symptoms or conditions linked to excess stress hormone production.
Common Symptoms That May Require This Test
- Sudden, severe headaches with no clear cause
- Excessive sweating, particularly in episodes
- Rapid or irregular heartbeat (palpitations)
- High blood pressure that is difficult to control
- Episodes of anxiety or a sense of panic
- Pallor, nausea, or unexplained weight loss
- Flushing or persistent fatigue
Conditions This Test Can Help Detect
The normetanephrines free plasma test can help identify several conditions, including the following:
- Phaeochromocytoma: A rare tumour forming in the adrenal gland that, in most cases, is non-cancerous but can occasionally be malignant
- Paraganglioma: Tumours that arise from nerve tissue outside the adrenal gland and release stress hormones into the bloodstream
- Neuroblastoma: The most common solid tumour found outside the brain in childhood; plasma normetanephrine is a highly accurate marker for this condition
- Genetic syndromes: Conditions such as multiple endocrine neoplasia (MEN) types 2A or 2B and von Hippel-Lindau (VHL) disease, which predispose a person to adrenal tumours
Normetanephrines, Free-Plasma Test for Chronic Disease Monitoring
This test plays an important role in long-term follow-up after treatment. Annual measurement of plasma-free metanephrines is recommended to check for tumour recurrence in patients who have had a phaeochromocytoma or paraganglioma removed.
Patients are advised to be screened postoperatively and then every year for at least 10 years, with ongoing monitoring for those at higher risk.
How to Prepare and What to Expect
Careful preparation is essential for this test, as several everyday factors can affect the result.
Do You Need to Fast?
Yes, fasting overnight (8 to 12 hours) is required before this test. You should also avoid caffeinated and decaffeinated beverages during this period. If you are having additional tests at the same time, fasting requirements may vary, so check with your doctor.
Practical Tips Before Your Test
- Avoid alcohol, coffee, tea, and tobacco for at least 12 hours before the test
- Skip strenuous exercise for at least 24 hours beforehand, as physical exertion can raise hormone levels
- Try to relax for 30 minutes before blood collection to avoid stress-induced elevations in normetanephrine levels
- Inform your doctor about all medicines you take, especially antidepressants, blood pressure medicines, and antipsychotics
Step-by-Step Procedure
- On arrival, you will be asked to lie down flat and remain in this position for at least 20 minutes before the blood draw begins.
- A trained phlebotomist will clean the skin on your arm and gently insert a needle into a vein.
- Blood is collected into a chilled EDTA tube and carefully mixed with preservatives by inverting the tube.
- The sample is processed promptly; the plasma is separated and transferred to a labelled transport tube, then kept refrigerated or frozen.
- The sample is dispatched to the laboratory, where it is analysed using LC-MS/MS (liquid chromatography-tandem mass spectrometry), a highly accurate method.
- Your report will be available within 5 to 7 working days.
Factors That Can Affect Accuracy
- Stress, acute illness, or physical exertion around the time of the test
- Use of tricyclic antidepressants, atypical antipsychotics, or alpha-2 and beta blockers
- Alcohol, smoking, or withdrawal from opioids or benzodiazepines
- Sitting upright instead of lying down during sample collection
- Delay in processing the blood sample after collection
Understanding Your Normetanephrines, Free-Plasma Test Results
Your normetanephrines free plasma test result should always be reviewed by a doctor who knows your full medical history. The table below shows the general reference range used for this test:
| Category | Normetanephrine Level | Interpretation |
|---|---|---|
| Normal Levels | Typically <0.90 nmol/L or <180 pg/mL | Typically rule out catecholamine-secreting tumours. |
| Mild Elevation | 0.90–2.0 nmol/L or 180–400 pg/mL | May be due to stress, medication, or other underlying conditions. |
| Elevated Normetanephrines | >2.0 nmol/L or >400 pg/mL | Suggest the presence of a pheochromocytoma or paraganglioma, requiring further imaging (MRI or CT scan) to locate the tumour. |
| Highly Elevated Normetanephrines | >4.0 nmol/L or >800 pg/mL | Highly indicative of a catecholamine-secreting tumour. |
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
- Chronic kidney disease: Patients with impaired kidney function, particularly those on dialysis, commonly show significantly higher plasma free normetanephrine levels. Your doctor will take this into account when reviewing results.
- Acute illness or stress: Severe illness, acute stress, or withdrawal from certain substances can markedly raise levels, potentially giving a misleading result.
- Certain medications: Tricyclic antidepressants and medicines that block norepinephrine reuptake are well established to produce false-positive results for plasma normetanephrine.
How to Maintain Healthy Levels
- Practise stress management techniques such as breathing exercises, yoga, or meditation
- Follow a balanced diet and limit caffeine intake to reduce unnecessary adrenal stimulation
- Attend regular health check-ups, especially if there is a family history of adrenal tumours or related genetic syndromes
Lupin Diagnostics Normetanephrines, Free-Plasma Test Price and Home Collection
The normetanephrines free plasma test price starts at approximately ₹4,500, and home collection is available for this test. The table below shows indicative prices across major cities in India:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹4500 |
| Chennai | ₹4500 |
| Bengaluru | ₹4500 |
| Kolkata | ₹4500 |
| Pune | ₹4500 |
| Hyderabad | ₹4500 |
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 across cities, so you can have your blood drawn in the comfort of your home. All samples are processed in NABL-accredited laboratories by experienced technologists. Your digital report is shared directly via email or WhatsApp once it is ready.
Frequently Asked Questions
Metanephrine is produced when the body breaks down epinephrine (adrenaline), while normetanephrine comes from the breakdown of norepinephrine (noradrenaline). Both are measured together as fractionated metanephrines to give doctors a clear picture of adrenal hormone activity.
Standing or sitting upright causes the body to naturally release more stress hormones, which raises normetanephrine levels in the blood. Lying flat for at least 20 minutes before the draw keeps hormone levels stable and reduces the chance of a misleading result.
Yes, several medicines can affect the normetanephrines free plasma test, including tricyclic antidepressants, atypical antipsychotics, and certain blood pressure medicines. These can produce falsely elevated results. Always tell your doctor about every medicine you take before the test, and do not stop any medication without medical advice.
After surgery to remove a phaeochromocytoma or paraganglioma, this test is used to check whether the tumour has returned. Annual testing with plasma metanephrines is recommended for at least 10 years after surgery and potentially longer for patients at higher risk.
A mildly elevated result does not automatically confirm a tumour, as false positives can occur. Because phaeochromocytomas are rare, doctors typically confirm an elevated plasma result with a second test, such as a 24-hour urine metanephrines test, before drawing any conclusions.
Yes. Chronic kidney disease, particularly in patients receiving dialysis, is associated with significantly higher plasma normetanephrine levels. If you have kidney disease, your doctor will factor this into the interpretation of your result to avoid an incorrect diagnosis.
Normetanephrines, Free-Plasma Test: Booking, Price, and Results
