Table 1. Key HIV screening parameters.

Parameter	Value	Range	Source
Proportion tested in past 12 months (status quo)
High-risk individuals	23%	10–30%	[44]
Low-risk individuals	10%	5–20%	[44]
Symptom-based case finding per year
Symptomatic HIV	10%	0–30%	[35]
AIDS	20%	10–60%	[35]
Window period of detection (days)
3rd generation ELISA	22	14–40	[6], [7], [10]
4th generation immunoassay	17	10–28	[6], [18]
NAAT	11	9–30	[6], [11]
NAAT pooling algorithm sensitivity	95%	90–100%	[39]
NAAT pooling efficiency (tests/specimen)	0.11	0.10–1.0	[2], [39]
Proportion tested who receive NAAT test results	80%	50–100%	[17]
Reduction in sexual partners if identified	50%	20–70%	[8], [9], [45]
Cost of 3rd-generation ELISA	$15	$10–$25	[11], [35], [43], [46], [47]
Cost of Western Blot confirmatory test	$40	$25–$50	[47]
Cost of NAAT	$120	$100–$150	[11]–[14], [39], [46]
Cost of quantitative viral load assay	$120	$100–$140	[48], [49]
Cost of HIV counseling	$60	$40–$100	[35], [42], [43]

ELISA  =  enzyme linked immunosorbent assay; NAAT  =  nucleic acid amplification test.