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

Table 2

Recovery of cotinine in urine and saliva samples.

	Expected value [ng/mL]	Measured* [ng/mL]	Recovery [%]
Urine; Before spiking; 0.884 ± 0.055 ng/mL	0.8	0.63±0.01	78.5
	40	38.8±3.4	97
	80	76.4±3	95.6
	120	113.1±4.6	94.3
	2000	1977±96.3	98.8
	3800	3728±76.6	98.1
Saliva; Before spiking; 0.701 ± 0.041 ng/mL	0.4	0.40±0.037	100.5
	20	20.06±0.56	100.3
	40	38.4±4.2	95.9
	80	80±2.9	100.5
	120	113.6±2.2	94.7
	500	506.1±7.36	101.1
	900	907±10.5	100.7

∗All values are means ± SD.