Table 3.

Analytic quality parameters for 1-MT, TRP and its metabolites.

Analyte	Accuracy (%)	Precision (%)	Range (µM)	Linearity (R)
1-MT	−7.8–4.0	2.3–7.0	2.3−69	0.9966–0.9992
TRP	−5.9–3.3	1.7–9.9	1.2–49	0.9986–0.9995
KYN	−9.5–13.5	3.9–14.5	0.24–24	0.9969–0.9990
KYNA	−9.9–15.7	6.8–14.9	0.01–0.32	0.9931–0.9946
QUIN	−19.8–18.4	7.6–19.8	18–359	0.9590–0.9957