Table 2.

Overview of absolute and logarithmic PEI/WHO quantification results of all six compared assays with nominal concentrations of 25–1,000 IU/mL

Nominal standard	Median concentrations
	artus			CTM v1			CTM v2			HPS			RealTime			Versant
IU/mL [log IU/mL]	IU/mL	Range	log IU/mL	IU/mL	Range	log IU/mL	IU/mL	Range	log IU/mL	IU/mL	Range	log IU/mL	IU/mL	Range	log IU/mL	IU/mL	Range	log IU/mL
1,000 [3.0] PEI	699	497–884	2.84	1070	890–1110	3.03	468	450–603	2.67	399	236–455	2.60	675	648–718	2.83	575	533–747	2.76
1,000 [3.0] WHO	543	319–627	2.73	568	373–757	2.75	200	166–564	2.30	209	156–299	2.32	481	405–508	2.68	322	321–473	2.51
500 [2.7] PEI	898	797–963	2.95	511	391–557	2.71	263	187–429	2.42	159	150–184	2.20	340	319–364	2.53	359	305–434	2.56
500 [2.7] WHO	303	300–482	2.48	217	161–238	2.34	127	113–473	2.10	120	101–147	2.08	220	214–243	2.34	223	204–249	2.35
200 [2.3] PEI	239	238–345	2.38	193	122–198	2.29	62	51–94	1.79	det.	det.–69	det.	132	127–174	2.12	144	81–148	2.16
200 [2.3] WHO	227	det.–245	2.36	46	44–61	1.66	21	14–46	1.32	29	det.–48	1.46	96	93–106	1.98	125	105–134	2.10
100 [2.0] PEI	91	86–100	1.96	94	78–98	1.97	29	25–41	1.61	det.	det.–34	det.	87	67–93	1.94	106	97–108	2.03
100 [2.0] WHO	92	det.–103	1.96	det.	det.	det.	17	14–19	1.23	det.	det.	det.	51	32–62	1.71	62	57–79	1.79
25 [1.4] PEI	91	det.–98	1.96	det.	det.	det.	det.	det.–21	det.	det.	det.	det.	32	31–41	1.51	50	46–100	1.70
25 [1.4] WHO	150	0–185	2.18	det.	det.	det.	det.	0–18	det.	det.	det.	det.	28	15–33	1.45	49	23–50	1.69

det. = detected but below LLOQ; 0 = target not detected