Table 5. Agreement between the Architect, Liaison, and Platelia assays.

	Agreement (95% CI)	Architect vs Liaison	Architect vs Platelia	Liaison vs Platelia
VCA IgM	Kappa	0.79 (0.62–0.95)	0.46 (0.20–0.72)	0.51 (0.24–0.79)
	Total, %	97.8 (95.4–99.0)	96.1 (93.1–97.8)	96.8 (94.0–98.3)
	Negative, %	98.5 (96.2–99.4)	100.0 (98.6–100)	100.0 (98.6–100)
	Positive, %	85.7 (60.1–96.0)	31.3 (14.2–55.6)	35.7 (16.3–61.2)
VCA IgG	Kappa	0.80 (0.70–0.90)	0.69 (0.59–0.79)	0.64 (0.53–0.75)
	Total, %	94.6 (91.3–96.7)	90.0 (85.9–93.0)	88.2 (83.9–91.5)
	Negative, %	80.4 (66.8–89.3)	97.7 (87.9–99.6)	89.1 (77.0–95.3)
	Positive, %	97.4 (94.5–98.8)	88.6 (83.9–92.0)	88.0 (83.2–91.6)
EBNA IgG	Kappa	0.92 (0.87–0.98)	0.89 (0.83–0.95)	0.88 (0.81–0.94)
	Total, %	97.1 (94.4–98.5)	96.1 (93.1–97.8)	95.3 (92.2–97.3)
	Negative, %	88.9 (79.6–94.3)	96.9 (89.3–99.1)	90.3 (81.3–95.2)
	Positive, %	100.0 (98.2–100.0)	95.8 (92.2–97.8)	97.1 (93.8–98.7)

Abbreviations: CI, confidence interval; VCA, viral capsid antigen; EBNA, Epstein-Barr virus nuclear antigen.