Skip to main content
. Author manuscript; available in PMC: 2011 Oct 19.
Published in final edited form as: Clin Chem. 2009 Mar 5;55(6):1188–1195. doi: 10.1373/clinchem.2008.114405

Table 1.

LOQ, mean slope (SD), mean intercept (SD), r2 range, and linear range (n = 10) for low and high calibration curves for THC, 11-OH-THC, and THCCOOH in whole blood by SPE and 2D electron impact GC-MS.

Compound LOQ, μg/L Curve Mean slope (SD) Mean intercept (SD) r2, range Linear range, μg/L
THC 0.25 Low 0.171 (0.013) 0.005 (0.004) 0.995–1.000 0.25–25
High 0.137 (0.014) 0.590 (0.558) 0.995–1.000 25–100
11-OH-THC 0.5 Low 0.183 (0.013) 0.009 (0.005) 0.994–0.999 0.5–25
High 0.121 (0.013) 1.271 (0.395) 0.991–1.000 10–75
THCCOOH 0.25 Low 0.191 (0.013) 0.004 (0.003) 0.996–1.000 0.25–25
High 0.149 (0.016) 0.814 (0.623) 0.992–1.000 25–100