Table 6 Point of Care Testing Regime: Home HIVST Setting (Funded by Consumer)
True HIV Positive (PHIV) | True HIV Negative (1 − PHIV) | |||||
|---|---|---|---|---|---|---|
Outcomes | HIVST+, EIA+, WB+ | HIVST - | HIVST +, EIA- | HIVST+, EIA+, WB- | HIVST+ EIA- | HIVST - |
Probability of result | (PHIV ∗ SenHIVST ∗ SenEIA ∗ SenWB ) | PHIV ∗ (1 − SenHIVST) | (PHIV ∗ SenHIVST ∗ (1 − SenEIA)) | ((1 − PHIV) ∗ (1 − SpecHIVST) ∗ (1 − SpecEIA) + SpecWB ) | ((1 − PHIV) ∗ (1 − SpecHIVST) ∗ SpecEIA ) | (1 − PHIV) ∗ SpecHIVST |
Inputs | ||||||
 Visit 1: Initial Screening | ||||||
  Staffing | Self | Self | Self | Self | Self | Self |
  OraQuick® In-Home HIV Test | $54.75 | $54.75 | $54.75 | $54.75 | $54.75 | $54.75 |
  Postage | $7.50 | $7.50 | $7.50 | $7.50 | $7.50 | $7.50 |
Confirmatory Testing conducted at Bulk Billing GP | ||||||
 Visit 1: Initial Screening | ||||||
  Consult time | 20 min | 20 min | 20 min | 20 min | ||
  Medicare Rebate | $71.701 | $71.701 | $71.701 | $71.701 | ||
  Staffing | GP | GP | GP | GP | ||
 Pathology costs | ||||||
  EIA test | $15.652 | $15.652 | $15.652 | $15.652 | ||
  WB confirmatory | $29.003 | $29.003 | ||||
 Visit 2: Test Results | ||||||
  Consult time | 40 min | 20 min | 20 min | 20 min | ||
  Medicare Rebate | $105.554 | $71.701 | $71.701 | $71.701 | ||
  Staffing | GP | GP | GP | GP | ||
Total Cost of Each Outcome | $284.15 | $62.25 | $221.30 | $250.30 | $221.30 | $62.25 |
Total Cost of Each Outcome (excluding private costs) | $221.90 | $0 | $159.05 | $188.05 | $159.05 | $0 |
Average cost per person tested | =(PHIV ∗ SenHIVST ∗ SenEIA ∗ SenWB) ∗ AC per True PositiveHIVST + , EIA + , WB+ + (PHIV ∗ (1 − SenHIVST)) ∗ AC per False NegativeHIVST− + (PHIV ∗ SenHIVST ∗ (1 − SenEIA)) ∗ AC per False NegativeHIVST + , EIA− + ((1 − PHIV) ∗ SpecHIVST) ∗ AC True NegativeHIVST− + ((1 − PHIV) ∗ (1 − SpecHIVST) ∗ SpecEIA) ∗ False PositiveHIVST + , EIA− + ((1 − PHIV) ∗ (1 − SpecHIVST) ∗ (1 − SpecEIA) ∗ SpecWB) ∗ False PositiveHIVST + , EIA + , WB− | |||||
Average number of tests for a positive diagnosis | \( =\frac{1}{P_{HIV}\ast Se{n}_{HIV ST}\ast Se{n}_{EIA}\ast Se{n}_{WB}} \) | |||||