Cascade of Lost Testing Opportunities. This cascade shows lost opportunities for screening at each phase in the visit. The largest decrements were in identifying appropriate patients to screen at triage (54.8% of eligible patients identified and enrolled) and obtaining patient acceptance of screening (36.0% of those identified to screen). Of the 788 patients amenable to screening, 34.8% did not complete the consent and blood work. *Approximately 10% returned to receive negative test results. 0.19% of screened patients were found to have HIV.