This prospective study aims to evaluate the diagnostic value and reliability of blood cultures obtained from different sources-central venous catheter (CVC), dialysis machine, and peripheral vein-in hemodialysis patients with suspected catheter-related bloodstream infections (CRBSIs). By comparing the timing and rates of bacterial growth from each site, the study seeks to identify the most accurate and timely method for diagnosing bloodstream infections in this patient population. In addition, the study will assess the dynamics of parathyroid hormone (PTH) levels during acute infections. Specifically, it will investigate whether a significant drop in PTH levels-and the rate of recovery following infection-correlates with adverse outcomes such as infectious complications, cardiovascular morbidity, or 90-day mortality. These findings may offer valuable prognostic insights and support improved monitoring and treatment strategies for dialysis patients experiencing infection.