What does the Norepinephrine test measure?

Why is Norepinephrine measured?

Urinary norepinephrine patterns are used to explore stress-axis activation, anxiety, and sympathetic tone. Elevated levels may accompany chronic stress or phaeochromocytoma (the latter requires plasma or 24-hour urine metanephrines for diagnosis); low levels can suggest adrenal insufficiency or blunted stress response, though dried-urine results are not interchangeable with plasma or 24-hour standards.

Reference ranges

Standard reference

Laboratory-specific functional ranges provided by Sanesco; distinct from 24-hour urinary or plasma metanephrine assays used in phaeochromocytoma screening.

Functional medicine optimal

Sanesco provides method-specific optimal ranges; these are not interchangeable with hospital laboratory phaeochromocytoma screening cut-offs.

Units

ng/mg creatinine, μg/g creatinine, µg/g creatinine

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.