Low cost VisiTect screening | High cost VisiTect screening | VDRL screening | |
Test cost ($) (A) | 0.9 | 3.2 | 0.06 |
Testing time cost (B) | 2.4 | 2.4 | 1.2 |
Total test and testing cost ($) (C) | 3.3 | 5.6 | 1.26 |
Cost ($) per person screened (D) | 3.3*523/506 = 3.41 | 5.6*523/506 = 5.79 | 1.26*506/506 = 1.26 |
Cost ($) per case identified by test | 3.3*523/57 = 30.3 | 5.6*523/57 = 51.4 | 1.26*506/39 = 16.3 |
Cost ($) per case of syphilis (test results confirmed by FTA-Abs) | 3.3*523/52 = 33.2 | 5.6*523/52 = 56.3 | 1.26*506/38 = 16.8 |
Cost ($) per case of active syphilis (test results confirmed by FTA-Abs and VDRL) | 3.3*523/30 = 57.5 | 5.6*523/30 = 97.6 | 1.2*506/30 = 21.3 |
Test cost (A) = unit price of purchasing tests
Low cost VisiTect Syphilis with WHO/SDI procurement (Peeling, personal communication)
High cost VisiTect Syphilis with MOH/STI/Brazil procurement (personal communication)
VDRL with FUAM procurement (personal communication)
Testing time cost (B) = (no. time units) × (cost per time-unit) (time-unit: monthly lab or clinic staff salary, expressed hourly, divided by 60 mins)
Testing cost (C) = unit price of purchasing test + testing time cost
Cost per person screened (D) = testing cost of entire population + retesting cost of intermediate = C*(N+n-retest)/N
Cost per case identified by TEST = D divided by number of TEST positive
Cost per case of syphilis = D divided by number of TEST positive and FTA positive
Cost per case of active syphilis = D divided by number of TEST positive and FTA positive and VDRL positive
FTA-Abs, fluorescent treponemal antibody absorption test; VDRL, Venereal Diseases Research Laboratory assay.