A rapid and direct liquid chromatography–mass spectrometry (LC–MS) method was developed and validated for high-throughput biomonitoring of Per- and Polyfluoroalkyl Substances (PFAS) in human plasma. This approach streamlines the analytical workflow by replacing traditional, labor-intensive solid-phase extraction (SPE) with a simple protein-precipitation step. Twenty-three PFAS (PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, PFDA, PFUn...