TABLE 2.

Run-to-run precision: stratified by ranges of HCV core antigen assay concentration^a

Range of HCV core Ag concn (pg/ml)	% of specimens in rangea	Specimen	HCV core Ag (pg/ml)				CV (%)	Mean CV (%)
			1st run	2nd run	Mean	SD
1.5-25	18	2536	2.1	1.7	1.9	0.28	15	9.7
		2530	8.3	7	7.7	0.92	12
		2515	9.1	7.9	8.5	0.85	10
		2387	19.4	18.7	19.1	0.49	3
		2438	22.1	19.4	20.8	1.91	9
26-50	8.3	2456	35.8	30.6	33.2	3.68	11	6.8
		2543	38.7	43	40.9	3.04	7
		2481	41.6	45.4	43.5	2.69	6
		2318	42	37.5	39.8	3.18	8
		2555	46	46.9	46.5	0.64	1
51-75	4.3	1166	52.8	53.2	53	0.28	1	1.67
		0248	56.1	55.6	55.9	0.35	1
		2521	61.3	59	60.2	1.63	3
		2557	74.1	70.4	72.3	2.62	4
		2414	74.5	75.4	75	0.64	1
76-100	5.1	2392	76.4	81.6	79	3.68	5	6.88
		2258	80.1	78	79.1	1.48	2
		2042	84.3	92.5	88.4	5.8	7
		2274	86.8	78.9	82.9	5.59	7
		2336	96.3	78.3	87.3	12.7	15
101-125	4.5	2436	102.2	92.9	97.6	6.58	7	7.77
		2498	102.4	91.7	97.1	7.57	8
		2422	107.6	99.4	103.5	5.8	6
		2243	114	97.2	105.6	11.9	11
		2235	117	105.3	111.2	8.3	7
126-150	4.0	2256	127.7	103.3	115.5	17.3	15	8.57
		1787	129.7	129.1	129.4	0.42	0
		829	136.3	158.3	147.3	15.6	11
		1037	138.5	157.4	148	13.4	9
		2499	146.9	131.2	139.1	11.1	8

^aAmong 629 HCV core Ag-positive specimens in Table 1, 44.0% are represented in the ranges in this table (i.e., 1.5 to 150 pg/ml).