Table 2. Results of proficiency testing surveys for cardiac troponin^† (1).

Assay	Slope of regression equations^‡
Assay	2004	2009	2013	2016
Tosoh AIA	0.34	–	0.33	0.34
Ortho ECi	0.15	0.11	0.46	0.62
Beckman Acces’s	–^§	0.44	0.31	0.34
Abbott Architect	–	0.52	0.89	0.36
Siemens Stratus CS	0.70	0.15	0.51	0.54
Siemens Dimension	1.00	1.00	1.00	1.00
Siemens Centaur	1.20	1.50	1.46	0.86
Siemens Vista	–	2.10	1.06	1.00
Abbott AxSYM	4.50	0.60	–	–
Roche E6000	–	–	1.59	0.65
Ratio of slopes (high/low)	30–X	19–X	5.2–X	2.9–X

^†, results from the College of American Pathologists Proficiency Testing Survey for cardiac markers; ^‡, slopes report from a plot of each assay against (y) vs. the Dade Dimension (x, arbitrarily selected); ^§, no data available.

Table 2. Results of proficiency testing surveys for cardiac troponin† (1).

Table 2. Results of proficiency testing surveys for cardiac troponin^† (1).