The Types segment classifies Biologics Testing Services by the analytical methodology employed, offering a complementary taxonomy to the application view. Cell‑based assays dominate the methodological mix, leveraging live‑cell responses to evaluate functional activity and immunogenic potential, thereby supporting both potency and safety endpoints. Ligand‑binding assays (LBAs), such as ELISA and MSD platforms, constitute the second most prevalent type, providing high‑throughput quantification of antigen‑antibody interactions for PK and immunogenicity studies. Mass spectrometry‑based approaches—including LC‑MS/MS and MALDI‑TOF—serve niche but growing roles in structural characterization, impurity profiling, and detailed stability assessments. Chromatographic techniques (HPLC, UPLC) underpin purity and potency verification through separation‑based quantitation. In‑silico and bioinformatics tools are emerging as adjunct types, facilitating data integration across assay suites and predictive modeling of immunogenic risk. Each methodological type contributes distinct value to the overall market, influencing cost structures, turnaround times, and regulatory acceptance, thereby shaping the comprehensive Biologics Testing Service segmentation framework.