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Table 2 Consistency and PPV at different COI values for HIV screening

From: HIV infection in Xi’an, China: epidemic characterization, risk factors to false positives and potential utility of the sample-to-cutoff index to identify true positives using Architect HIV Ag/Ab combo

First-test-reactive (Ag/Ab Combo) Retesting by 3rd-generation PPV (%)
Groups (COI Values) N0. Reactive (TP) Non-reactive (TP) Consistency(%)
L (1.00–10.00) 93 2 (0) 91 (0) 2.15 0
M (10.00–30.00) 14 12 (6) 2 (1) 85.71 50
H (≥30.00) 110 110 (110) 0 100 100
Total 217 124 (116) 93 (1) 57.14 53.92
  1. Note: TP was true positive