Biochemical diagnosis of phaeochromocytoma using plasma‐free normetanephrine, metanephrine and methoxytyramine: importance of supine sampling under fasting conditions

To document the influences of blood sampling under supine fasting versus seated nonfasting conditions on diagnosis of phaeochromocytomas and paragangliomas (PPGL) using plasma concentrations of normetanephrine, metanephrine and methoxytyramine.

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