Detection Limits-In vitro Detection Limits-In vivo Approximate Neurochemical Concentration
Catecholamine DA 2 nM 20 nM ~0.2 nM
Serotonin 5-HT 1 nM 10 nM ~0.5 nM
Homovanillic Acid HVA 20 nM 0.2 µM 7 nM
Tryptophan L-TP 20 nM 0.2 µM 1 µM
Dynorphin DYN 4 nM 40 nM 2 µM
Somatostatin SRIF 3.7 nM 37 nM 4 µM
Table 1: Preliminary data: detection limits for compounds studied intraoperatively.