Q1, m/z

Q3, m/z

Dwell time, msec

DP, volt

EP, volt

CE, volt

CXP, volt

Metanephrine

180.1

148.1

25

123

7

24

17

Metanephrine-IS

183.1

168.1

25

123

7

24

17

Normetanephrine

166.1

134.1

50

95

7

24

13

Normetanephrine-IS

169.1

137.1

50

95

7

24

13
Table 1: MRM transitions and mass spectrometer settings for normetanephrine, metanephrine, and the internal standards.