Table 1. Precision and accuracy for the determination of olanzapine and N-desmethyl-olanzapine in spiked plasma.

Analyte	Spiked concentration (ng/mL)	Repeatability (CV %)	Accuracy (Error %)	Interday Precision (CV %)	Interday Accuracy (Error %)	Recovery (%)
olanzapine	1	19.76	–12.89	12.35	–12.17	73.26
	5	13.19	3.92	8.73	–8.91	88.08
	20	2.66	–11.65	3.99	–7.08	84.90
	40	2.50	7.81	2.56	8.22	84.38
	100	0.46	–1.08	3.87	–1.24	93.83
N-desmethyl-olanzpine	1	14.69	–4.04	6.95	–16.45	73.46
	5	8.31	11.76	13.95	–5.66	83.68
	20	8.64	–5.73	8.23	6.53	89.13
	40	3.27	7.92	3.08	5.83	78.31
	100	5.63	–3.86	5.08	–2.23	90.41