Table 1. . Intra-assay, interassay imprecision and inaccuracy of plasma paracetamol quantitation.

Nominal concentration (mg/l)	Observed concentration (mg/l)	Intra-assay			Observed concentration (mg/l)	Inter-assay
		Mean accuracy (%)	SD	%CV		Mean accuracy (%)	SD	%CV
0.125	0.122	86.6	2.0	1.8	0.122	86.3	2.5	2.3
0.119				0.117
0.119				0.123
0.123
0.120
0.25	0.251	98.9	2.3	0.9	0.251	99.1	2.3	0.9
0.254				0.250
0.250				0.255
0.253
0.249
5	5.282	110.0	55.4	1.0	5.282	110.1	40.0	0.7
5.226				5.224
5.290				5.180
5.215
5.161
30	32.920	109.4	334.5	1.0	32.920	109.3	462.9	1.4
32.465				31.978
32.656				32.327
32.086
32.151							*

%CV: Coefficient of variation.