Table 9.

Example of incurred patient sample re-analysis.

Patient sampling schedule (h)	Measured [MX] (ng/ml)		E (ng/ml)a	%REb
	First analysis	Re-analysis after 9 months
Pre-dose	no peak	no peak	not applicable	not applicable
0.250	5.36	5.69	0.33	6.2
0.500	8.95	10.2	1.25	14.0
0.750	16.2	18.2	2.0	12.3
0.983	20.5	22.1	1.6	7.8
1.17	25	27.1	2.1	8.4
2.00	24.2	24.3	0.1	0.4
4.00	18.3	20	1.7	9.3
6.00	19	19.5	0.5	2.6
8.00	18.9	17.5	−1.4	−7.4
12.0	15.6	16.2	0.6	3.8
24.0	13.3	13.2	−0.1	−0.8
48.0	9.46	10	0.54	5.7
72.0	6.56	6.46	−0.10	−1.5
96.0	4.46	4.76	0.3	6.7
120	3.55	3.69	0.14	3.9
168	2.11	2.29	0.18	8.5
192	1.55	1.76	0.21	13.5
216	1.22	1.39	0.17	13.9

^aE (error) = value of first analysis − value of re-analysis

^b%RE (percent relative error) = (error/value of first analysis) × 100%