Table 1. Specificity with individual HIV-negative clinical specimens: determination of 29 copies/mL as the negative cutoff and subsequent verification in the modified assay.

Negative cutoff determination			Negative cutoff verification
N	N below negative cutoff	Specificity (95% Lower Confidence Limit)	N	N below negative cutoff	Specificity (95% Lower Confidence Limit)
450	436	96.9% (95.2%)	144	140	97.2% (93.8%)