Table 1.

Definition and Results of Concordance Study

		Comparative method (BD HLA‐B27 kit on BD FACSCalibur)
		Positive	Gray zone	Negative	BD FACSVia row total
Test method (BD HLA‐B27 kit on BD FACSVia)	Positive	a = 72	b = 8	c = 0	a + b + c = 80
	Inconclusive	d = 1	e = 11	f = 3	d + e + f = 15
	Negative	g = 0	h = 0	i = 499	g + h + i = 499
	BD FACSCalibur column total	a + d + g = 73	b + e + h = 19	c + f + i = 502	n = 594

Note: (a) Overall concordance was calculated as 100*{(a + e + i)/n} = 100*582/594 = 98%. (b) The five hundred and ninety four (594) samples were from 594 donors.