Metanephrine, Plasma (Free)
- Plasma Metanephrines
- Fractionated Plasma Free Metanephrines
Catecholamines are chemicals produced by tumor cells (pheochromocytoma) that cause increased and prolonged high blood pressure that does not respond to treatment. These catecholamines are made up of epinephrine and norephinephrine, which are broken down into metanephrine and normetanephrine. High blood levels of both (or either) are seen in people with pheochromocytomas, and the results are very accurate. There are many medications that can affect the testing of metanephrines, or affect the test results. Normal levels depend upon the lab that is doing the testing.
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