Forest plots of point-of-care CD4 diagnostic accuracy performance by non-laboratory staff.

(a) point-of-care CD4 testing by non-laboratory staff compared to conventional laboratory-based testing by professional laboratory staff; (b) point-of-care CD4 testing by non-laboratory staff compared to point-of-care CD4 testing by professional laboratory staff; the shaded box represents +/- 50 cells/ul in (a) and (b). (c) sensitivity of correctly classifying patients below a CD4 threshold of 350 cells/ul; (d) specificity of correctly classifying patients above a CD4 threshold of 350 cells/ul.