Therapeutic drug monitoring (TDM) is pivotal in chronic inflammatory diseases—such as IBD (Crohn’s/UC), rheumatoid arthritis, psoriasis/psoriatic arthritis, and spondyloarthritis—to optimize biologic and immunomodulator therapy by aligning trough drug levels and anti-drug antibody (ADA) status with disease activity. At Southern Medical Supplies Limited (SMSL), we offer a comprehensive TDM menu for monoclonal antibodies (e.g., anti-TNF, anti-integrin, anti-IL agents) and select small-molecule/adjunct therapies, providing drug concentrations, neutralizing/non-neutralizing ADA assessment, and reflex panels with CRP/ESR and, for IBD, fecal calprotectin—all to guide dose intensification, interval adjustment, or switching. Our portfolio spans ELISA, chemiluminescent immunoassay, and rapid workflows with validated pre-analytical guidance (timed trough sampling, matrix requirements), sourced from a broad network of trusted global partners—EUROIMMUN, Ansh Labs, Randox, Streck, Bio-Rad, Abbott, Roche, Siemens Healthineers, Qiagen, bioMérieux, Cepheid, Werfen, Globe Scientific, ELGA LabWater, LW Scientific, Sebia, LTA SRL, Acrobiotech, MAKOL Innovacion Medica, Rayto Life and Analytical Sciences, Diazyme, Hardy’s Diagnostics, and Teco Diagnostics—delivering the sensitivity, specificity, and reproducibility clinicians need to personalize therapy and improve long-term outcomes.