With its superior qualitative and quantitative capabilities and robustness, LCMS is commonly used to meet the rigorous demands of the analytical market and industries. LCMS is applied in many industries such as pharmaceuticals, biopharmaceuticals, forensic, industrial, food and environmental sector. For clinical research, the analysis of drugs, vitamins and minerals in whole blood, plasma, serum and urine is conducted routinely using LCMS. It is also applied in metabolomics, proteomics and genomics study. The use of LCMS in the biopharmaceutical discipline have enabled the bioanalysis and characterization of antibody drugs. In the environmental field, LCMS is widely utilized for the qualitative and quantitative determination of known pollutants (e.g. pesticides, bacteria, pharmaceuticals and personal care products) and trace-level emerging contaminants. Food safety and development have also adopted the use of LCMS in their product quality control such as the quantitation of residual veterinary drugs, food additives and the composition analysis of supplements and organic foods. With high sensitivity, high detection selectivity and high qualitative capability, MS bring about the flexibility of simultaneous multi-component analysis, improved productivity and efficiency to HPLC analyses in these applications.