High-Performance Liquid Chromatography (HPLC) stands as a robust analytical technique with extensive applications in clinical diagnostics. Its versatility enables the precise separation, identification, and quantification of complex mixtures in biological samples. We propose integrating HPLC into clinical diagnostic procedures to enhance the accuracy, sensitivity, and efficiency of disease detection and monitoring. By leveraging HPLC’s capabilities, we aim to streamline the analysis of biomarkers, drugs, metabolites, and toxins in various bodily fluids, facilitating rapid and reliable diagnosis of diseases ranging from metabolic disorders to cancers. Moreover, HPLC’s ability to analyze multiple analytes simultaneously can expedite patient assessment and treatment decision-making processes. This chapter advocates for strategically incorporating HPLC technology into clinical diagnostic protocols, ensuring improved patient outcomes through enhanced diagnostic precision and efficiency.