Table 3.

Diagnostic accuracy of CEA

	Sensitivity (%) with 95% CI*	Specificity (%) with 95%CI*	LR +ve† with 95% CI*	LR-ve‡ with 95% CI*	PPV§ (%) with 95% CI*	NPV? (%) with 95% CI*
Serum CEA Positive	86 (73-94)	64 (49-77)	2.39 (1.62-3.51)	0.22 (0.11-0.45)	70 (57-81)	82 (66-92)
BALF CEA Positive	92 (80-98)	56 (41-70)	2.09 (1.51-2.89)	0.14 (0.05-0.38)	68 (55-78)	87 (71-96)
Both Serum & BALF Positive	92 (80-98)	62 (46-75)	2.39 (1.65-3.47)	0.13 (0.05-0.35)	71 (58-82)	88 (72-97)

*CI=Confidence Interval, ^†LR+ve=Likelihood ratio positive, ^‡LR-ve=Likelihood ratio negative, ^§PPV=Positive predictive value, ?NPV=Negative predictive value.