Description
A 24-hour urinary normetanephrine test measures the amount of normetanephrine, a metabolite of norepinephrine, excreted in your urine over a 24-hour period. This test is often used to help diagnose pheochromocytomas and paragangliomas, tumors that can cause the overproduction of catecholamines like norepinephrine.
- Normal levels: Generally, normal values for normetanephrine in a 24-hour urine collection are less than 600 µg/24h, according to Top Doctors UK.
- Elevated levels: If the levels are significantly higher than normal, it could suggest the presence of a tumor.
- Moderately elevated levels: If the levels are only slightly elevated, it could be due to other factors like stress, certain medications, or diet.




