Renal function testing is essential for early detection and management of acute and chronic kidney disease, guiding therapy and preventing cardiovascular complications. At Southern Medical Supplies Limited (SMSL), we offer a comprehensive menu covering serum creatinine with race-free CKD-EPI eGFR (2021), cystatin C confirmation, BUN/urea, full electrolytes and acid–base panels, urinalysis (dipstick + microscopy), urine albumin-to-creatinine (ACR) and protein-to-creatinine (PCR) ratios, 24-hour protein studies, and optional AKI biomarkers (e.g., NGAL, KIM-1). For immune-mediated renal disease, we support complement (C3/C4), ANA/ENA, ANCA, and anti-GBM testing, alongside infectious rule-outs and renin–aldosterone assessment in hypertensive kidney disease. Our portfolio spans clinical chemistry, immunoassay/ELISA, molecular, and urinalysis automation from an expanded network of trusted 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 accuracy, sensitivity, and reproducibility clinicians need to diagnose, stage, and monitor kidney disease with confidence.