These are the results of comparison of control values for all analytical series for participating laboratories (102) after having finished data collection. The quotients HIGH/LOW, P/CAL and X/CAL have been calculated for all series submitted and statistics for the results are presented below. Mean and s (standard deviation) have been calculated using results between median/1.5 and medianx1.5. (Pål Rustad, 25/1-2002)
Component	Quotient	Median	No of analytical series	Mean	s	%CV	No of analytical series*
Na	HIGH/LOW	1.384	104	1.383	0.024	1.7 %	104
	P/CAL	1.029	107	1.027	0.015	1.5 %	107
	X/CAL	1.025	108	1.024	0.012	1.2 %	108
K	HIGH/LOW	2.000	105	1.985	0.070	3.5 %	105
	P/CAL	1.035	107	1.027	0.047	4.6 %	107
	X/CAL	1.000	108	0.999	0.015	1.5 %	108
Creatinin	HIGH/LOW	1.995	105	2.006	0.165	8.2 %	104
	P/CAL	0.987	106	0.979	0.049	5.0 %	106
	X/CAL	1.048	108	1.051	0.051	4.9 %	108
Urea	HIGH/LOW	2.010	99	2.037	0.114	5.6 %	99
	P/CAL	0.916	99	0.916	0.020	2.2 %	99
	X/CAL	1.020	100	1.02	0.023	2.3 %	100
Protein	HIGH/LOW	1.965	78	1.971	0.059	3.0 %	78
	P/CAL	1.026	80	1.02	0.041	4.0 %	79
	X/CAL	1.025	83	1.024	0.014	1.4 %	83
Albumin	HIGH/LOW	1.952	108	2.037	0.211	10.4 %	107
	P/CAL	0.971	109	0.964	0.044	4.6 %	109
	X/CAL	1.020	111	1.016	0.025	2.5 %	111
Glucose	HIGH/LOW	2.016	96	2.035	0.076	3.7 %	94
	P/CAL	0.892	96	0.886	0.035	4.0 %	95
	X/CAL	0.988	98	0.985	0.022	2.2 %	98
Ca	HIGH/LOW	1.487	103	1.487	0.058	3.9 %	103
	P/CAL	1.013	104	1.01	0.022	2.2 %	104
	X/CAL	1.022	106	1.021	0.017	1.7 %	106
Mg	HIGH/LOW	1.994	82	1.988	0.111	5.6 %	82
	P/CAL	1.003	82	1.004	0.022	2.2 %	82
	X/CAL	1.013	83	1.016	0.025	2.5 %	83
P inorg	HIGH/LOW	2.003	102	1.994	0.069	3.5 %	102
	P/CAL	1.056	102	1.051	0.022	2.1 %	102
	X/CAL	1.013	103	1.013	0.018	1.8 %	103
Uric acid	HIGH/LOW	2.033	103	2.027	0.066	3.3 %	101
	P/CAL	0.856	104	0.85	0.028	3.3 %	104
	X/CAL	1.064	105	1.058	0.030	2.8 %	105
Cholesterol	HIGH/LOW	2.009	105	2.016	0.055	2.7 %	104
	P/CAL	1.019	107	1.012	0.047	4.6 %	107
	X/CAL	1.064	109	1.062	0.018	1.7 %	109
Trigly	HIGH/LOW	2.000	104	2.011	0.074	3.7 %	103
	P/CAL	1.079	105	1.078	0.031	2.9 %	103
	X/CAL	0.986	107	0.986	0.027	2.7 %	107
Bilirubin	HIGH/LOW	2.401	106	2.451	0.330	13.5 %	102
	P/CAL	0.844	108	0.837	0.062	7.4 %	108
	X/CAL	1.043	110	1.056	0.067	6.3 %	110
ALP	HIGH/LOW	1.959	93	1.912	0.128	6.7 %	92
	P/CAL	0.927	94	0.921	0.041	4.5 %	94
	X/CAL	1.097	96	1.097	0.041	3.7 %	96
Amylase	HIGH/LOW	2.025	64	2.032	0.124	6.1 %	63
	P/CAL	1.094	73	1.094	0.032	2.9 %	71
	X/CAL	1.032	76	1.038	0.037	3.6 %	76
AST	HIGH/LOW	1.975	93	1.981	0.196	9.9 %	92
	P/CAL	0.761	94	0.758	0.043	5.7 %	94
	X/CAL	1.075	96	1.072	0.049	4.6 %	96
Alt	HIGH/LOW	2.089	104	2.066	0.265	12.8 %	92
	P/CAL	0.695	105	0.688	0.066	9.6 %	105
	X/CAL	1.368	107	1.367	0.109	8.0 %	105
CK	HIGH/LOW	2.017	100	1.958	0.187	9.6 %	98
	P/CAL	0.667	101	0.666	0.025	3.8 %	101
	X/CAL	1.120	101	1.116	0.054	4.8 %	101
LD	HIGH/LOW	2.105	88	2.131	0.178	8.4 %	87
	P/CAL	1.009	88	1.003	0.063	6.3 %	88
	X/CAL	1.113	89	1.114	0.051	4.6 %	89
Fe	HIGH/LOW	2.000	91	2.077	0.204	9.8 %	91
	P/CAL	0.930	92	0.929	0.023	2.5 %	92
	X/CAL	0.946	93	0.943	0.019	2.0 %	93
TIBC	HIGH/LOW	2.037	35	2.028	0.104	5.1 %	35
	P/CAL	1.115	35	1.107	0.054	4.9 %	35
	X/CAL	1.013	34	1.007	0.034	3.4 %	34
T4	HIGH/LOW	1.6115	6	1.622	0.170	10.5 %	6
	P/CAL	1.2525	6	1.258	0.024	1.9 %	6
	X/CAL	1.022	6	1.022	0.034	3.3 %	6
GT	HIGH/LOW	1.947	93	1.889	0.181	9.6 %	92
	P/CAL	0.658	95	0.662	0.030	4.5 %	95
	X/CAL	0.984	96	0.977	0.045	4.6 %	96
TSH	HIGH/LOW	1.867	9	1.814	0.165	9.1 %	9
	P/CAL	1.071	9	1.029	0.076	7.4 %	9
	X/CAL	1.232	9	1.213	0.074	6.1 %	9
Ferritin	HIGH/LOW	1.958	8	1.981	0.078	3.9 %	8
	P/CAL	0.814	8	0.826	0.027	3.3 %	8
	X/CAL	1.068	8	1.059	0.035	3.3 %	8
P-Amylase	HIGH/LOW	2.017	32	2.018	0.044	2.2 %	32
	P/CAL	1.119	32	1.118	0.017	1.5 %	32
	X/CAL	1.078	31	1.08	0.019	1.8 %	31
HDL	HIGH/LOW	1.959	99	1.983	0.129	6.5 %	99
	P/CAL	1.217	102	1.215	0.035	2.9 %	100
	X/CAL	1.043	104	1.045	0.030	2.9 %	104