Rationale and Comments
Recommended first-line testing is either plasma free metanephrines or urinary fractionated metanephrines. If measuring plasma metanephrines, patients should have their blood drawn while in a supine position, and the values should be compared to reference intervals determined from the same collection position.
- American Society for Clinical Pathology
- Endocrine Society guidelines
- Lenders JW, Duh QY, Eisenhofer G, Gimenez-Roqueplo AP, Grebe SK, Murad MH, Naruse M, Pacak K, Young WF Jr. Pheochromocytoma and paraganglioma: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2014 Jun;99(6):1915-1942.