Table 5. Diagnostic accuracy of ceruloplasmin at the conventional cutoff value in patients with liver, nervous, and mental diseases.

CP(mg/L)	No. of patients diagnosed			Sensitivity(%, 95% CI)	Specificity(%, 95% CI)	PPV(%, 95% CI)	NPV(%, 95% CI)
	WD	Non-WD	Total
< 200	294	463	757	99.0(98.9–99.1)	76.4(74.5–78.3)	38.8(35.3–42.3)	99.8(99,7–99.9)
≥ 200	3	1499	1502
Total	297	1962	2259

CP, CI, confidence interval, Ceruloplasmin; WD, Wilson’s disease; PPV, positive predictive value; NPV, negative predictive value.