All content on Lab Tests Online has been reviewed and approved by our Editorial Review Board.
At a Glance
Why Get Tested?
To help confirm or rule out a rare adrenal tumor called a pheochromocytoma or a rare extra-adrenal tumor called a paraganglioma; these tumors produce excess hormones called catecholamines, which are broken down to metanephrines.
When to Get Tested?
After or in conjunction with plasma free metanephrines and/or urine metanephrines tests and when your healthcare provider needs additional information regarding a possible catecholamine-secreting tumor
A 24-hour urine sample; sometimes a blood sample drawn from a vein in your arm
Test Preparation Needed?
These tests are affected by certain drugs, foods, and stresses. Inform your healthcare provider of any medications you are taking and follow any preparation instructions you are given before sample collection. Although you may be seated for collection of the blood sample, it is recommended that you be lying down. Your healthcare provider or the collection site will instruct you as to their specific requirements.