What does elevated Normetanephrine mean?
High levels of Normetanephrine can be from a pheochromocytoma. This is usually a benign tumor that stems from aberrant cells in the adrenal gland. The tumor produces hormones that cause high blood pressure. The high blood pressure can cause life-threatening situations, such as a heart attack.
What is a metanephrines test?
What is this test? This test measures the substances metanephrine and normetanephrine in your blood. It helps find out if you have a tumor of the adrenal glands called pheochromocytoma. The adrenal glands sit on top of your kidneys.
How do you prepare for a metanephrines test?
Patient Preparation Patient should be fasting overnight (water and non-caffeinated soft drinks are permissible). Patient should avoid alcohol, coffee, tea, tobacco and strenuous exercise prior to collection. See Limitations section for more information about other potential causes of elevated metanephrines.
What is the normal level of metanephrines urine?
Metanephrine: 24 to 96 mcg/24 hours (some laboratories give the range as 140 to 785 mcg/24 hours)
What produces Normetanephrine?
Normetanephrine is a metabolite of norepinephrine created by action of catechol-O-methyl transferase on norepinephrine. It is excreted in the urine and found in certain tissues. It is a marker for catecholamine-secreting tumors such as pheochromocytoma.
What causes high Metanephrines in urine?
Certain medicines, foods, and conditions can cause metanephrine and catecholamine levels to be higher than normal. These include: Antidepressants and amphetamines. Physical or emotional stress.
How long do Metanephrines results take?
How long does the test take? The test will last between 30 and 60 minutes. You will be asked to lie down for approximately 30 minutes, then a blood sample will be taken by an endocrine nurse specialist and sent to an external lab to be tested. There is usually a wait of three to four weeks for the test results.
What is the difference between Metanephrine and Normetanephrine?
Normetanephrine and Metanephrine☆ The metanephrines normetanephrine (NMN) and metanephrine (MN) are O-methylated metabolites of the catecholamines norepinephrine (NE) and epinephrine (E). Metanephrine has a higher molecular weight (197) because, in contrast to NMN (183), it contains a methylated amino group.
