High-throughput screening is performed in which setting?

• A. In Vitro
• B. In Silico
• C. In Situ
• D. In Vivo

Answer: (D)

High-throughput screening is the rapid testing of many compounds against a target using automated, miniaturized assays. This is carried out in vitro, meaning outside a living organism, typically in multiwell plates with robotic handling and quick readouts like fluorescence or luminescence. The controlled, scalable environment of in vitro screening is what makes it feasible to test thousands or millions of substances quickly. In silico screening uses computer models to prioritize compounds before lab testing, which is not a physical lab setting. In situ means testing within the original tissue context but still outside the whole organism, and in vivo means testing inside a living organism, which is far less suited to the parallel, high-volume approach of HTS. So the standard setting for high-throughput screening is in vitro.