Table 2. Acceptable performance for each platform of three panels in 2015.

Analyte (units)	Platform	Number of panels reported effective results	Number of laboratories with acceptable performance	Acceptable performance (%)*
AFP (μg/L)	Beckman	491	488	99.39
	Roche	141	140	99.29
	DPC	66	66	100.00
AFP (KIU/L)	PerkinElmer	588	586	99.66
	Fenghua	178	177	99.44
	Darui	59	58	98.31
t-hCG (IU/L)	DPC	104	100	96.15
	Beckman	17	17	100.00
β-hCG (IU/L)	Beckman	466	463	99.36
	Roche	121	119	98.35
	Abbott	26	26	100.00
uE3 (nmol/L)	Beckman	497	462	92.96
	PerkinElmer	428	425	99.30
	DPC	97	95	97.94
free-β-hCG (μg/L)	PerkinElmer	589	587	99.66
	Fenghua	178	177	99.44
	Darui	59	58	98.31
AFP - alpha fetoprotein; t-hCG - total human chorionic gonadotropin; β-hCG - β-human chorionic gonadotropin; uE3 - unconjugated estriol; free-β-hCG - free β-human chorionic gonadotropin. *The acceptable performance (%) of each platform was defined as the total number of laboratories with acceptable performance of this platform in three panels divided by the total number of laboratories. Acceptable performance was attributed to scores ≥ 80. Acceptable result fell in the range of ± 30% or 5 μg/L (whichever was larger) of the assigned value, ± 30% for hCG, β-hCG, uE3, and free-β-hCG.