Table 2. Age-Related Upper Cut-off Values for Plasma Metanephrines and 3-Methoxytyramine.

Age, yr	Normetanephrine, nmol/L	Metanephrine, nmol/L	3-Methoxytyramine, nmol/L
5–17	0.47	0.45	0.10
18–29	0.58	0.45	0.10
30–39	0.70	0.45	0.10
40–49	0.79	0.45	0.10
50–59	0.87	0.45	0.10
>60	1.05	0.45	0.10