Normetanephrine High or Low: What Your Result Means
Other names: Normetanephrine, Normetanephrine Free, Normetanephrine, Free, Plasma, Normetanephrine Plasma, Free Normetanephrine, NMN, Normetanephrine Pl, Normetanephrine Free Plasma, Total free (MN+NMN)
Optimal Result:
0 - 145 pg/mL,
or
0 - 0.64 nmol/L.
QUICK ANSWER
Normetanephrine is a breakdown product of norepinephrine measured in plasma or urine. It is used primarily to screen for pheochromocytoma and paraganglioma.
A normal result makes pheochromocytoma very unlikely in most patients. A positive result does not confirm it — false positives are common.
| Normetanephrine level | Interpretation |
|---|---|
| Normal (below lab upper limit) | Pheochromocytoma/paraganglioma effectively excluded in low-risk patients |
| Mildly elevated (< 2× ULN) | Usually false positive — medications, stress, posture, or diet; repeat under controlled conditions |
| Moderately elevated (2–4× ULN) | Indeterminate — repeat testing and clinical review; clonidine suppression test may be considered |
| Highly elevated (> 4× ULN) | Highly specific for pheochromocytoma or paraganglioma; imaging indicated |
Common questions at a glance:
| Question | Short answer |
|---|---|
| Is a mildly high result serious? | Usually not — most mildly elevated results are false positives from medications or stress |
| Does high normetanephrine mean cancer? | Not usually — most pheochromocytomas are benign; false positives are more common than true positives for mild elevations |
| Can medications cause a false-positive? | Yes — tricyclic antidepressants, SNRIs, and decongestants are among the most common causes |
| Should I repeat the test? | Yes if mildly elevated — repeat under controlled conditions (supine, fasted, medication-free) |
| What if only normetanephrine is high? | Pattern may suggest paraganglioma or noradrenergic tumor; clinical review needed |
Most mildly elevated normetanephrine results are caused by medications, stress, posture during blood collection, or sleep apnea — not by pheochromocytoma. The key question is always whether the elevation persists under controlled conditions.
WHAT IS NORMETANEPHRINE?
When the adrenal glands and sympathetic nerves release norepinephrine, the enzyme catechol-O-methyltransferase (COMT) breaks it down into normetanephrine. Most circulating normetanephrine in pheochromocytoma patients is produced continuously inside tumor cells — which is why elevated levels are a sensitive marker even between symptomatic episodes. In healthy people, norepinephrine is released in bursts during stress, creating the variability that makes borderline elevations common in non-tumor situations.
Two testing formats:
| Test type | Sample | Notes |
|---|---|---|
| Plasma free normetanephrine | Blood (plasma) | Requires 20–30 min supine rest before draw; most convenient; slightly more sensitive |
| 24-hour urine fractionated metanephrines | Urine collected over 24 hours | Less affected by short-term stress and posture; often used as confirmatory test |
Both have similar diagnostic accuracy for pheochromocytoma when properly collected.
WHAT DOES HIGH NORMETANEPHRINE MEAN?
High normetanephrine triggers two key questions: how high, and is it the only abnormal catecholamine?
How high matters more than whether it is high:
| Elevation level | Typical interpretation | Next step |
|---|---|---|
| < 2× upper limit of normal | Usually false positive | Repeat under controlled conditions |
| 2–4× upper limit | Indeterminate | Repeat with strict prep; consider clonidine suppression test |
| > 4× upper limit | Highly specific for pheochromocytoma or paraganglioma | Imaging (CT or MRI of abdomen) |
Pattern: normetanephrine high, metanephrine normal
This is one of the most searched patterns in the query data and has specific clinical significance:
| Pattern explanation | What it may indicate |
|---|---|
| Paraganglioma (extra-adrenal sympathetic tumor) | These tumors preferentially secrete norepinephrine → predominantly normetanephrine elevation |
| Noradrenergic pheochromocytoma | Some adrenal tumors preferentially produce norepinephrine |
| Familial syndromes (SDHB, SDHD mutations) | Genetically-driven tumors often show a normetanephrine-predominant pattern |
| Non-tumor causes | Heart failure, sleep apnea, severe anxiety, certain medications — these can raise normetanephrine without raising metanephrine |
YOUR SPECIFIC NORMETANEPHRINE RESULT — WHAT DOES IT MEAN?
| Plasma free normetanephrine | Typical interpretation |
|---|---|
| Below lab upper limit | Normal — pheochromocytoma effectively excluded in low pre-test probability patients |
| 0.5–0.7 nmol/L (just above ULN for adults < 50) | Borderline — likely false positive; repeat under strict conditions |
| 0.7–1.0 nmol/L | Mildly elevated — retest supine, medication-free, fasted; most resolve |
| 1.0–2.0 nmol/L (roughly 2–4× ULN) | Indeterminate — clinical review essential; clonidine suppression may be appropriate |
| Above 2.0 nmol/L (roughly > 4× ULN) | Highly elevated — highly specific for tumor; imaging indicated |
| Above 3.0–4.0 nmol/L | Very high — pheochromocytoma or paraganglioma very likely; urgent evaluation |
Note on units: Some labs report in pg/mL, others in nmol/L. To convert: 1 nmol/L ≈ 169 pg/mL for normetanephrine. Always compare against your own lab's stated reference range, not just these thresholds.
WHAT CAUSES FALSE-POSITIVE HIGH NORMETANEPHRINE?
False positives are the most common result of a mildly elevated normetanephrine. Understanding what can raise it is essential before pursuing imaging.
Medications:
| Medication class | Examples | Effect |
|---|---|---|
| Tricyclic antidepressants | Amitriptyline, nortriptyline, imipramine | Most common medication cause of false positive |
| SNRIs | Venlafaxine, duloxetine | Frequently raise normetanephrine |
| MAO inhibitors | Phenelzine, tranylcypromine | Interfere with catecholamine metabolism |
| Sympathomimetics | Pseudoephedrine, phenylephrine, amphetamines | Direct adrenergic stimulation |
| Recreational drugs | Cocaine, methamphetamine | Significant elevation |
| Levodopa | Parkinson's treatment | Raises catecholamine metabolites |
| Buspirone | Anxiety medication | Can elevate |
| Withdrawal states | Clonidine, alcohol, benzodiazepine withdrawal | Rebound adrenergic surge |
Physiological causes:
| Cause | Notes |
|---|---|
| Acute stress / illness / hospitalization | Very common — Factor VIII is also an acute phase reactant; normetanephrine rises with any stress |
| Vigorous exercise within 24 hours | Raises plasma catecholamine metabolites |
| Blood draw posture (seated vs supine) | Seated draws have substantially higher false-positive rates — supine rest for 20–30 min is required |
| Heart failure | Chronic sympathetic activation raises normetanephrine persistently |
| Obstructive sleep apnea (untreated) | Repeated nocturnal hypoxia activates sympathetic system |
| Severe or chronic anxiety | Can produce mildly elevated levels |
| Caffeine within 12 hours | Transient elevation |
WHAT DOES LOW NORMETANEPHRINE MEAN?
Low normetanephrine is generally not concerning. Healthy people naturally have low baseline levels.
Specific situations where very low levels occur include metyrosine treatment (this medication blocks catecholamine synthesis and is used to prepare patients with pheochromocytoma for surgery), autonomic failure syndromes (rare neurological conditions affecting the sympathetic nervous system such as multiple system atrophy or pure autonomic failure), and certain medications (alpha-methyldopa, reserpine).
A low result in someone without symptoms requires no follow-up.
HOW TO PREPARE FOR THE TEST
Pre-test conditions strongly affect normetanephrine results. Failing to follow these steps is the most common reason for a false-positive result.
| Preparation step | Timeframe |
|---|---|
| Avoid caffeine, alcohol, and nicotine | At least 12 hours before |
| Avoid vigorous exercise | 24 hours before |
| Avoid acetaminophen | 48 hours before (relevant for some older assays; verify with your lab) |
| Avoid catecholamine-rich foods: bananas, chocolate, vanilla, citrus, nuts, aged cheeses | 24 hours before |
| Rest supine (lying flat) before plasma blood draw | 20–30 minutes before needle insertion |
| Discuss medications with your doctor | Stop tricyclic antidepressants, SNRIs, and decongestants 1–2 weeks before if clinically safe |
If your sample was drawn seated, after walking in from the waiting room, or without any rest period, and came back mildly elevated — a repeat under proper conditions is the single most informative next step before ordering imaging.
MOST COMMON CLINICAL SCENARIOS
| Pattern | Most likely explanation |
|---|---|
| Normetanephrine 0.7–0.9 nmol/L, blood drawn seated without rest | Collection artifact — false positive from posture; repeat supine |
| Normetanephrine 0.8–1.0 nmol/L while taking venlafaxine or amitriptyline | Medication effect — SNRI and TCA interference; discuss stopping before retest |
| Normetanephrine 1.0–1.2 nmol/L with untreated obstructive sleep apnea | Chronic sympathetic activation from nocturnal hypoxia — may improve with CPAP |
| Normetanephrine mildly elevated during or shortly after illness or hospitalization | Acute stress response — retest 6–8 weeks after recovery |
| Normetanephrine 0.9 nmol/L → 0.45 nmol/L on repeat supine draw | Collection artifact confirmed — no further action needed |
| Normetanephrine 2.5 nmol/L on repeat testing under strict conditions | Strong biochemical suspicion for tumor — imaging indicated |
| Normetanephrine elevated, metanephrine normal | Pattern suggests paraganglioma or noradrenergic pheochromocytoma — clinical review |
| Normetanephrine normalized after surgical tumor removal | Biochemical cure confirmed — excellent outcome marker |
METANEPHRINE VS NORMETANEPHRINE — WHAT'S THE DIFFERENCE?
These two markers are almost always tested together. Understanding the difference helps interpret the pattern of results:
| Marker | Parent hormone | What it reflects |
|---|---|---|
| Metanephrine | Epinephrine (adrenaline) | Adrenal medulla secretion — the adrenal gland is the primary source of epinephrine |
| Normetanephrine | Norepinephrine (noradrenaline) | Both adrenal medulla and sympathetic nerve terminals — wider source |
Pattern interpretation:
| Result pattern | Most likely clinical significance |
|---|---|
| Normetanephrine elevated, metanephrine normal | Paraganglioma (extra-adrenal tumor) or noradrenergic pheochromocytoma; also non-tumor causes (SNRIs, sleep apnea, heart failure) |
| Metanephrine elevated, normetanephrine normal | Adrenal pheochromocytoma — adrenal tumors more commonly produce epinephrine |
| Both elevated | Larger or mixed-secretion adrenal pheochromocytoma; most clinically significant pattern |
| Both normal | Pheochromocytoma effectively excluded in most cases |
Ratio note: Some centers track the metanephrine-to-normetanephrine ratio for tumor localization; this is specialist territory and beyond routine lab interpretation.
AGE-ADJUSTED NORMETANEPHRINE REFERENCE RANGES
Normetanephrine levels rise with age — a result that would be mildly elevated in a 30-year-old may be within normal limits for a 65-year-old. Always compare against your own lab's age-specific range.
| Age group | Typical plasma free normetanephrine upper limit |
|---|---|
| Adults < 50 years | ~0.50 nmol/L (~90 pg/mL) |
| Adults ≥ 50 years | ~0.89 nmol/L (~196 pg/mL) |
Why levels rise with age: Sympathetic nervous system activity increases with aging as part of normal cardiovascular adaptation. This is one reason a result of 0.65 nmol/L that would flag as elevated in a 35-year-old may fall within normal range for a 60-year-old on a properly age-calibrated reference range.
Important: Not all labs provide age-adjusted ranges. If your report shows a single adult reference range without age stratification, your result may be compared against a more conservative threshold. Discuss with your clinician whether age-adjusted interpretation applies to your result.
SYMPTOMS OF PHEOCHROMOCYTOMA — WHAT TO WATCH FOR
Many users arrive at this page because they or their doctor noticed symptoms. The classic presentation involves episodic rather than constant symptoms:
| Symptom | Why it happens |
|---|---|
| Episodic severe hypertension | Surges of catecholamine release from the tumor cause acute blood pressure spikes |
| Palpitations or rapid heart rate | Adrenergic stimulation of the heart — can feel like a pounding or racing heart |
| Sweating | Sympathetic activation drives sweat gland activity |
| Severe headaches | Often accompany blood pressure spikes |
| Pallor or flushing | Vasoconstriction or vasodilation from catecholamine effects |
| Anxiety or sense of impending doom | High adrenaline levels mimic acute anxiety |
| Tremor | Excess catecholamines produce fine tremor |
| Weight loss | Metabolic effect of chronic catecholamine excess |
The classic triad is headache + sweating + palpitations occurring together episodically. All three together with hypertension has high specificity for pheochromocytoma.
Important: Many people with elevated normetanephrine have no symptoms at all — the test may have been ordered as part of a hypertension workup or incidental finding. The absence of symptoms does not exclude a small pheochromocytoma, which is one reason the biochemical test is so valuable.
WHEN SHOULD I SEEK URGENT MEDICAL ATTENTION?
Pheochromocytoma can cause life-threatening catecholamine surges. Seek emergency care if elevated normetanephrine is accompanied by any of the following:
- Severe, sudden-onset hypertension (blood pressure above 180/120 mmHg)
- Chest pain or pressure
- Sustained rapid heart rate (above approximately 130 beats per minute at rest)
- Fainting or near-fainting
- Severe headache that feels different from usual
- Sudden shortness of breath
- Symptoms of stroke: sudden weakness or numbness on one side, sudden vision change, sudden speech difficulty
These symptoms require emergency evaluation regardless of the normetanephrine level. A pheochromocytoma crisis (hypertensive emergency from tumor) is a medical emergency and can be life-threatening without treatment.
MOST COMMON NORMETANEPHRINE RESULTS
| Result | Typical interpretation |
|---|---|
| Normal (within lab range) | Reassuring — tumor effectively excluded in low pre-test probability |
| Slightly above upper limit | Most commonly false positive — repeat under controlled conditions |
| 2–4× upper limit | Indeterminate — requires clinical review and possibly clonidine suppression |
| > 4× upper limit | Highly specific for pheochromocytoma or paraganglioma |
| Isolated normetanephrine elevation with normal metanephrine | May suggest paraganglioma or noradrenergic tumor; evaluate pattern with clinician |
| Both normetanephrine and metanephrine elevated | More typical of adrenal pheochromocytoma; imaging indicated if > 4× ULN |
WHEN SHOULD I REPEAT THE TEST?
Because normetanephrine is acutely sensitive to posture, medications, stress, and diet, a single elevated result rarely represents the whole picture. Repeat testing under controlled conditions is often the most important next step:
| Situation at time of testing | Recommendation |
|---|---|
| Blood drawn while seated or without supine rest | Repeat with 20–30 min supine rest before draw |
| Recent acute illness, surgery, or hospitalization | Repeat 6–8 weeks after full recovery |
| Taking tricyclic antidepressants or SNRIs | Discuss stopping 1–2 weeks before retest with prescriber |
| Consumed caffeine, alcohol, or relevant foods before draw | Repeat with proper fasting and dietary preparation |
| Exercise within 24 hours of draw | Repeat after 24-hour exercise abstinence |
| Mildly elevated without obvious trigger (< 2× ULN) | Repeat under strict conditions — most resolve |
| Confirmed elevation > 4× ULN on careful repeat | Imaging (CT or MRI of abdomen and pelvis) is the next step |
TREND INTERPRETATION
For HealthMatters users tracking normetanephrine over time:
| Pattern | Clinical meaning |
|---|---|
| Consistently normal across multiple tests | Pheochromocytoma effectively excluded; reassuring pattern |
| Single elevation → normal on careful repeat | False positive confirmed — no further action needed |
| Mildly elevated across multiple careful tests | Persistent low-level elevation warrants clinical review; possible early or small tumor, or chronic non-tumor cause |
| Rising trend across months | Warrants evaluation — possible growing tumor or progressive autonomic condition |
| Very high → normalized after surgical removal of adrenal tumor | Confirms biochemical cure — excellent prognostic finding |
| Fluctuating markedly between tests | Suggests pre-analytical variability (posture, stress) rather than fixed tumor |
CONFIRMATORY TESTING
If plasma normetanephrine is elevated above the equivocal zone but below 4× ULN, confirmatory approaches include:
Repeat testing under strict conditions — supine rest, medication-free, fasted. This resolves most false positives.
24-hour urine fractionated metanephrines — less affected by acute stress and posture; a useful complement to plasma testing.
Clonidine suppression test — clonidine suppresses catecholamine release from healthy sympathetic nerves but not from tumor cells. A normetanephrine that fails to fall by ≥40% after clonidine and remains elevated is suspicious for pheochromocytoma. This test is most useful in the 2–4× ULN indeterminate zone.
Imaging (CT or MRI) is the next step when biochemical evidence is strong — not before. Imaging should follow biochemical confirmation, not precede it.
DOES HIGH NORMETANEPHRINE MEAN CANCER?
Most pheochromocytomas are benign. The clinical danger comes from the hormones they release — dangerous blood pressure spikes, arrhythmias — not from metastatic spread. Approximately 10–15% of pheochromocytomas are malignant and require additional treatment. After surgical removal of a benign tumor, normetanephrine typically returns to normal.
| Pattern | Cancer concern |
|---|---|
| Mildly elevated with medication or stress trigger | Very low — false positive more likely than tumor |
| Confirmed elevation > 4× ULN | Tumor likely; most are benign pheochromocytomas |
| Pheochromocytoma confirmed, normetanephrine very high | Malignancy risk higher with very large tumors, extra-adrenal location, or SDHB mutation |
| SDHB mutation carrier with elevated normetanephrine | Higher malignancy risk — specialist management |
SLEEP APNEA AND NORMETANEPHRINE — A COMMON FALSE-POSITIVE PATTERN
Untreated obstructive sleep apnea (OSA) is one of the most clinically important and underrecognized causes of persistently elevated normetanephrine. Unlike medication effects or single stressful blood draws, OSA-related elevation can persist across multiple properly collected tests — mimicking the pattern of a true tumor.
The mechanism: repeated episodes of nocturnal hypoxia and arousal activate the sympathetic nervous system, driving sustained increases in norepinephrine release and normetanephrine production. In patients with moderate-to-severe untreated OSA, normetanephrine can be persistently elevated in the 0.7–1.5 nmol/L range.
Clinical implications:
| Situation | What it means |
|---|---|
| Normetanephrine mildly elevated + known untreated OSA | OSA is likely contributing — treat OSA with CPAP and retest |
| Normetanephrine mildly elevated + snoring, daytime sleepiness, obesity | Consider sleep study before pursuing pheochromocytoma workup |
| Normetanephrine normalizes after CPAP initiation | OSA was the cause — no further tumor evaluation needed |
| Normetanephrine remains elevated after OSA treatment | Pheochromocytoma workup still warranted |
Many endocrinologists consider "mild normetanephrine elevation + untreated OSA" one of the most common false-positive patterns encountered in practice.
GENETIC SYNDROMES AND NORMETANEPHRINE PATTERNS
For patients with a known or suspected hereditary syndrome, the pattern of normetanephrine elevation carries additional clinical meaning. Several genetic conditions predispose to pheochromocytoma or paraganglioma with characteristic biochemical signatures:
| Gene mutation | Tumor type | Typical normetanephrine pattern | Notes |
|---|---|---|---|
| SDHB | Paraganglioma (often extra-adrenal) | Normetanephrine predominantly elevated | Higher malignancy risk; normetanephrine elevation without metanephrine elevation is characteristic |
| SDHD | Head and neck paragangliomas | Often mild or absent normetanephrine elevation | Head/neck tumors may not secrete catecholamines |
| RET (MEN2) | Adrenal pheochromocytoma | Both metanephrine and normetanephrine may be elevated | MEN2-associated tumors often bilateral |
| VHL | Noradrenergic pheochromocytoma | Normetanephrine elevation, often low or absent metanephrine | VHL tumors rarely malignant but bilateral in up to 50% |
| NF1 | Adrenal pheochromocytoma | Both metanephrine and normetanephrine may be elevated | Often discovered incidentally on imaging |
If you have a family history of pheochromocytoma, paraganglioma, MEN2, VHL disease, or neurofibromatosis (NF1), genetic counseling and specialist evaluation are appropriate alongside biochemical testing.
FAQ about Normetanephrine
-
What does it mean when normetanephrine is high?
A high normetanephrine has several possible causes, ranging from medication effects and stress to pheochromocytoma (a usually-benign adrenal tumor). How high matters more than whether it is high: mild elevations under 2× the upper limit of normal are usually false positives; levels above 4× the upper limit are highly specific for a tumor and warrant imaging. -
What is the normal range for normetanephrine?
For plasma free normetanephrine, typical adult reference is below approximately 0.50 nmol/L (or below 145 pg/mL), with the upper limit rising in adults over 50 years. For 24-hour urine, typical adult ranges are below approximately 600 µg per 24 hours. Reference ranges vary substantially by lab and method — always check the range printed on your own report. -
What does it mean if normetanephrine is high but metanephrine is normal?
An isolated normetanephrine elevation can indicate a paraganglioma (extra-adrenal tumor), a noradrenergic pheochromocytoma, certain familial syndromes (SDHB or SDHD mutations), or non-tumor causes including heart failure, sleep apnea, tricyclic antidepressants, and SNRIs. The clinical context and magnitude of elevation determine the next step. -
Can stress or anxiety raise normetanephrine levels?
Yes. Acute stress, recent illness, vigorous exercise, and even the anxiety of the blood draw itself can raise plasma normetanephrine. Samples should ideally be drawn after resting supine for 20–30 minutes. Severe chronic anxiety can also produce mildly elevated results. -
What medications cause false-positive normetanephrine results?
Tricyclic antidepressants, SNRIs (such as venlafaxine and duloxetine), MAO inhibitors, sympathomimetics (pseudoephedrine, phenylephrine), levodopa, cocaine, methamphetamine, buspirone, and withdrawal from clonidine, alcohol, or benzodiazepines can all cause falsely elevated results. Many of these should be stopped 1–2 weeks before testing when clinically safe. -
How accurate is normetanephrine for diagnosing pheochromocytoma?
Plasma free metanephrines (which includes normetanephrine) is among the most sensitive biochemical tests in medicine — sensitivity approaches 99% in published studies. A normal result in a person without high pre-test probability makes pheochromocytoma very unlikely. -
What is the difference between plasma and urine normetanephrine testing?
Plasma testing measures circulating levels at a single point and requires careful pre-test preparation including supine rest. 24-hour urine testing averages levels over a full day and is less affected by short-term stress or posture. Both have similar diagnostic accuracy when properly collected. Many clinicians order both for confirmation. -
Should I avoid coffee before a normetanephrine test?
Yes. Avoid caffeine, alcohol, and nicotine for at least 12 hours before the test. Caffeine can transiently raise catecholamine metabolite levels. -
What foods should I avoid before a normetanephrine test?
For 24 hours before the test, avoid foods high in catecholamines or their precursors: bananas, chocolate, vanilla, citrus fruits, nuts, aged cheeses, smoked or pickled foods, and alcohol. These can raise normetanephrine in some assays. -
What is a clonidine suppression test?
A confirmatory test used when plasma normetanephrine is mildly to moderately elevated. Clonidine suppresses catecholamine release from healthy sympathetic nerves but does not suppress release from pheochromocytoma cells. If normetanephrine fails to fall by at least 40% after clonidine and remains elevated, it strongly suggests a tumor. -
My normetanephrine was 4× the upper limit of normal — does that mean I have pheochromocytoma?
An elevation above 4× the upper limit of normal is highly specific for pheochromocytoma or paraganglioma when the test is properly collected and typically warrants imaging. The next step is CT or MRI of the adrenal glands and abdomen to locate the tumor. Your doctor will interpret the result in full clinical context. -
Is pheochromocytoma cancerous?
Most pheochromocytomas (around 85–90%) are benign. The clinical danger comes from the hormones they release — dangerous blood pressure spikes — not from cancer spread. About 10–15% are malignant. After surgical removal of a benign tumor, normetanephrine levels typically return to normal.
Lab Results Explained and Tracked
What does it mean if your Normetanephrine result is too high?
Elevated normetanephrine (above the lab's upper limit of normal) most commonly reflects a false positive from medications, stress, posture at blood draw, or dietary factors — not a tumor. Tricyclic antidepressants and SNRIs are among the most frequent medication causes; seated blood draws and recent acute illness are common physiological causes. When the elevation exceeds 4× the upper limit of normal on a properly collected sample, the result is highly specific for pheochromocytoma or paraganglioma and typically warrants imaging of the adrenal glands. Between these two extremes — the 2–4× upper limit zone — repeat testing under controlled conditions (supine rest, medication-free, properly fasted) and sometimes a clonidine suppression test is used to distinguish true tumor signal from physiological noise.
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What does it mean if your Normetanephrine result is too low?
Low normetanephrine in plasma or urine is generally not clinically significant and does not require follow-up in people without symptoms. Very low levels can occur during metyrosine treatment (used to block catecholamine synthesis in patients with pheochromocytoma preparing for surgery), in rare autonomic failure syndromes such as multiple system atrophy or pure autonomic failure where sympathetic outflow is reduced, or from medications such as alpha-methyldopa or reserpine that deplete catecholamine stores. A low normetanephrine result in a routine blood test with no other concerning findings needs no action.
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