Estimation of Cutoff Values of Cotinine in Urine and Saliva for Pregnant Women in Poland

Table 1

Validation parameters of the LC-MS/MS method of determination of cotinine in saliva and urine.

	LOD [ng/mL]	LOQ [ng/mL]	Range of linearity [ng/mL]	Correlation coefficient 𝑟^2	Uncertainty (𝑘=2) [%]	Accuracy [%]	Recovery∗ [%]
Urine	0.05	0.8	0.8–4000	0.9997	9.3	4.27	93.72±7.6
Saliva	0.05	0.4	0.4–1000	0.9993	6.0	2.33	99.10±2.6

∗All values are means ± SD.