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OBJECTIVES: To understand real-world implementation of the updated CDC HIV diagnostic testing algorithm. STUDY DESIGN: Retrospective database analysis. METHODS: Using data from Quest Diagnostics, we identified patients with at least 1 HIV-1/HIV-2 antibody differentiation test (BioRad Geenius HIV 1/2 Supplemental Assay [Geenius]) between January 1 and December 31, 2017. Study measures included Health Insurance Portability and Accountability Act--compliant patient demographics, test results, test frequency, and sequence relative to the CDC HIV diagnostic algorithm, including HIV-1 RNA Qualitative Assay (Aptima) or HIV-2 nucleic acid test (NAT). RESULTS: A total of 26,319 patients were identified (mean [SD] age, 40.7 [14.3] years; 66.4% male), with 28,954 Geenius tests, 7234 Aptima tests, and 298 HIV-2 NATs. In 26.4% of test sequences, the Geenius results were indeterminate or negative and required subsequent confirmatory NATs. A total of 8.5% of patients had more than 1 Geenius test in 2017, and 11.2% of the time, results of the first and second tests differed. A total of 74.2% of test sequences matched the CDC-recommended algorithm. CONCLUSIONS: Our study findings suggest that the CDC HIV diagnostic algorithm is complex and may pose suboptimal testing efficiency. Opportunities to improve diagnostic efficiency by reducing indeterminate results and repeat tests are warranted. [ABSTRACT FROM AUTHOR]

OBJECTIVES: In the United States, approximately 12 million individuals seek medical care for pharyngitis each year, accounting for about 2% of ambulatory care visits. Although the gold standard for diagnosing group A streptococcus (GAS) is culture, it is time intensive. Rapid antigen detection tests (RADT) with or without culture confirmation are commonly used instead. Although RADT provide results quickly, they generally have lower test sensitivity. Recently, point-of-care nucleic acid amplification tests (POC NAAT) have emerged. This study evaluates the cost-effectiveness and budget impact to the US payer of adopting POC NAAT. STUDY DESIGN: This study was a cost-effectiveness analysis, with costs and outcomes calculated via a decision tree. METHODS: A decision-tree model quantified costs and outcomes associated with a GAS diagnostic strategy using POC NAAT compared with RADT + culture confirmation. Model inputs were derived from the published literature. Model outputs included costs and clinical effects: qualityadjusted life-days lost, GAS and antibiotic complications, number of patients appropriately treated, and antibiotic utilization. Sensitivity and scenario analyses were performed. RESULTS: Base-case analysis projected that a POC NAAT strategy would cost $44 per patient compared with $78 for RADT + culture. Compared with RADT + culture, POC NAAT would increase the number of appropriately treated patients and avert unnecessary use of antibiotics. The budget impact of POC NAAT was --0.4% relative to current budget over 5 years. Findings were robust in sensitivity analyses. CONCLUSIONS: Our results suggest that POC NAAT would be less costly and more effective than RADT + culture; POC NAAT adoption may yield cost savings to US third-party payers. Access to POC NAAT is important to optimize GAS diagnosis and treatment decisions in the United States. [ABSTRACT FROM AUTHOR]