Assay Technologies in Pharmaceutical and Biomedical Sciences: Principles, Classification, Validation, and Emerging Innovations

Abstract

Assay technologies constitute fundamental analytical tools for the detection, identification, and quantification of chemical, biological, and molecular entities across pharmaceutical, clinical, environmental, and research domains. Rapid advancements in instrumentation, automation, miniaturization, and data analytics have significantly improved assay sensitivity, specificity, throughput, and reproducibility. This research-oriented review systematically evaluates the classification, working principles, operational mechanisms, validation parameters, applications, advantages, and limitations of major assay technologies, including chemical, biological, immunological, chromatographic, spectroscopic, electrochemical, and molecular assays. Furthermore, recent technological innovations such as lab-on-a-chip platforms, point-of-care diagnostics, multiplex assays, biosensors, next-generation sequencing, and artificial intelligence–assisted interpretation are critically discussed. The study aims to provide a structured and comprehensive scientific overview of assay methodologies for pharmacy professionals and researchers, emphasizing regulatory compliance and quality assurance frameworks.