Stability and reference intervals of spot urinary fractionated metanephrines and methoxytyramine by tandem mass spectrometry as a screening method for pheochromocytoma and paraganglioma.

Adding 3-MT to diagnosis model can improve diagnostic sensitivity to some extent, and the analysis of spot urinary MNs and 3-MT can provide reliable diagnostic information in a much shorter diagnostic time, it may reduce the medical expenses indirectly.