Table 3. Sensitivity, specificity, negative predictive value, and positive predictive value of the Pima CD4 test (finger stick and venous) compared to the reference method BD FACSCalibur.

Pima CD4 Test	Sensitivity (95%CI)	Specificity (95%CI)	NPV (95%CI)	PPV (95%CI)
Finger stick <250 cells/µl	0.963 (0.791−0.998)	0.866 (0.798−0.914)	0.992 (0.951−0.999)	0.565 (0.412−0.708)
Finger stick <300 cells/µl	0.932 (0.803−0.982)	0.795 (0.715−0.859)	0.972 (0.915−0.993)	0.603 (0.477−0.717)
Venous <250 cells/µl	0.943 (0.795−0.990)	0.854 (0.789−0.901)	0.986 (0.947−0.998)	0.569 (0.433−0.696)
Venous <300 cells/µl	0.982 (0.892−0.999)	0.753 (0.675−0.818)	0.991 (0.945−0.999)	0.598 (0.490−0.697)

CI = confidence interval, NPV = negative predictive value, PPV = positive predictive value.