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Also reported in: nmol/day
Normal urinary norepinephrine reflects adequate sympathetic nervous system catecholamine production and excretion. This is compatible with healthy alertness, attention, blood pressure regulation, and stress response capacity.
Very low urinary norepinephrine indicates noticeable depletion of sympathetic nervous system catecholamine output. Norepinephrine is essential for alertness, blood pressure regulation, attention, and fight-or-flight stress response. Very low levels are seen in autonomic failure, noticeable adreduced kidney function, or profound catecholamine depletion from very large chronic stress exhaustion.
Seek urgent medical evaluation. Autonomic function testing, adrenal function testing, and specialist evaluation are needed.
Urine Norepinephrine: {{value}} {{unit}} — very low (ref: {{low}}–{{high}}; critical: <5)Low urinary norepinephrine reflects reduced sympathetic nervous system output. Norepinephrine drives alertness, concentration, motivation, executive function, and mood arousal. Low norepinephrine is associated with fatigue, brain fog, difficulty focusing, low blood pressure, and depression characterized by lack of motivation and anergy. This pattern is also seen in ADHD and atypical depression.
Support with tyrosine-rich diet, regular vigorous exercise, adequate protein, and quality sleep. Address cortisol and adrenal health if other markers point to your brain–adrenal stress system dysfunction.
Urine Norepinephrine: {{value}} {{unit}} — low (ref: {{low}}–{{high}})Borderline low norepinephrine suggests the sympathetic nervous system is producing catecholamines in the lower portion of the normal range. This can contribute to difficulty with sustained attention, reduced arousal, and mild fatigue. Lifestyle factors — particularly adequate exercise and sleep — have strong evidence for supporting norepinephrine output.
Regular vigorous aerobic exercise is one of the most effective interventions for raising norepinephrine. Address sleep quality and stress management.
Urine Norepinephrine: {{value}} {{unit}} — borderline low (ref: {{low}}–{{high}}; borderline: 15–20)Normal urinary norepinephrine reflects adequate sympathetic nervous system catecholamine production and excretion. This is compatible with healthy alertness, attention, blood pressure regulation, and stress response capacity.
Normal result. Maintain with healthy lifestyle and stress management.
Urine Norepinephrine: {{value}} {{unit}} — normal (ref: {{low}}–{{high}})Optimal urinary norepinephrine in the mid-normal range reflects a well-calibrated sympathetic nervous system with adequate catecholamine production for alertness, attention, and healthy stress response. This range is associated with good cognitive performance, healthy blood pressure regulation, and appropriate stress reactivity without excess.
Excellent result. Maintain with regular exercise and healthy lifestyle.
Urine Norepinephrine: {{value}} {{unit}} — optimal (ref: 20–70)Borderline elevated urinary norepinephrine can reflect chronic psychological stress, anxiety, pain, essential hypertension, sleep apnea, or stimulant use (caffeine, medications). It indicates a modestly elevated sympathetic nervous system tone. Sustained sympathetic activation contributes to cardiovascular risk and anxiety amplification.
Address chronic stress, sleep quality, and cardiovascular risk factors. Reduce stimulants if applicable. Recheck under better-standardized conditions.
Urine Norepinephrine: {{value}} {{unit}} — borderline elevated (ref: {{low}}–{{high}}; borderline: 80–100)Elevated urinary norepinephrine indicates heightened sympathetic nervous system output. While chronic stress and anxiety can modestly elevate this, significant elevation raises concern for a catecholamine-secreting tumor (pheochromocytoma secreting predominantly norepinephrine, which may contribute to sustained hypertension more than episodic hypertension). This is also seen with noticeable obstructive sleep apnea, and cardiac decompensation.
Discuss with your doctor. Plasma free metanephrines and clinical evaluation for pheochromocytoma are appropriate alongside assessment of hypertension, sleep apnea, and stress state.
Urine Norepinephrine: {{value}} {{unit}} — elevated (ref: {{low}}–{{high}}; elevated: >80)Very high urinary norepinephrine is a major finding requiring urgent investigation for pheochromocytoma — a catecholamine-secreting adrenal or extra-adrenal tumor. Pheochromocytoma can cause noticeable hypertensive crises, stroke, cardiac arrhythmias, and death if undiagnosed and untreated. Norepinephrine-predominant pheochromocytomas often cause sustained noticeable hypertension rather than classic paroxysmal symptoms.
Seek urgent medical evaluation. Plasma free metanephrines, CT/MRI of the adrenal glands, and specialist endocrinology assessment are required immediately.
Urine Norepinephrine: {{value}} {{unit}} — very high (ref: {{low}}–{{high}}; critical: >200)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.