Table 1B.

Accuracy and precision of quality controls.

Nominal (ng/mL)	GM (ng/mL)	SD (ng/mL)	CV (%)	DEV (%)	WRP	BRP	n
0.5	0.510	0.0553	10.8	2.00%	5.19	9.80	20
1.5	1.55	0.100	6.45	3.33%	1.99	6.20	20
1000	1060	44.3	4.18	5.90%	3.41	3.69	20
4000	4180	201	4.81	4.48%	–	4.98	20

Abbreviations: GM, grand mean; SD, standard deviation; CV (%), coefficient of variation; DEV (%) relative deviation from nominal value; WRP, within-run precision; BRP, between-run precision; n, total number of samples. Each QC level was prepared fresh daily in quintuplet on each of four days. A dash (–) indicates no observed CV as a result of performing the assay in different runs.