Danaher is a life sciences and diagnostics company whose products help pharmaceutical and biotech companies develop and manufacture drugs, help researchers study biology and disease, and help hospitals and labs diagnose patients. Danaher operates through three segments: Biotechnology (~40% of revenue), Life Sciences (~30%), and Diagnostics (~30%). The Biotechnology segment is anchored by Cytiva, which sells bioreactors, filtration systems, chromatography resins, cell culture media, and single-use hardware used to manufacture biologic medicines — primarily monoclonal antibodies. The Life Sciences segment sells instruments, consumables, and reagents to research labs and drug developers through businesses including SCIEX (mass spectrometry), Beckman Coulter Life Sciences (flow cytometry), Leica Microsystems (microscopy), IDT and Aldevron (genomics), and Abcam (protein research tools). The Diagnostics segment sells clinical instruments and test kits to hospitals and labs, with Cepheid (PCR-based point-of-care testing), Beckman Coulter Diagnostics (clinical lab analyzers), Radiometer (acute care), and Leica Biosystems (pathology) as key businesses. More than 80% of Danaher's revenue is recurring, driven by consumables tied to an installed base of instruments — a model with high switching costs, particularly in bioprocessing where consumables are specified into FDA-regulated manufacturing processes. Danaher has built its portfolio through decades of acquisitions and manages operations through the Danaher Business System, an internal lean manufacturing and continuous improvement framework central to its operating culture.