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Background and objectives Patients receiving hemodialysis are at risk of cardiovascular events. A novel blood test ( T 50 test) determines the individual calcification propensity of blood. Design, setting, participants, & measurements T 50 was determined in 2785 baseline serum samples of patients receiving hemodialysis enrolled in the Evaluation of Cinacalcet Therapy to Lower Cardiovascular Events (EVOLVE) trial and the T 50 results were related to patient outcomes. Results Serum albumin, bicarbonate, HDL cholesterol, and creatinine were the main factors positively/directly and phosphate was the main factor negatively/inversely associated with T 50 . The primary composite end point (all-cause mortality, myocardial infarction [MI], hospitalization for unstable angina, heart failure, or peripheral vascular event [PVE]) was reached in 1350 patients after a median follow-up time of 619 days. After adjustments for confounding, a lower T 50 was independently associated with a higher risk of the primary composite end point as a continuous measure (hazard ratio [HR] per 1 SD lower T 50 , 1.15; 95% confidence interval [95% CI], 1.08 to 1.22; P T 50 was associated with a higher risk in all-cause mortality (HR per 1 SD lower T 50 , 1.10; 95% CI, 1.02 to 1.17; P =0.001), MI (HR per 1 SD lower T 50 , 1.38; 95% CI, 1.19 to 1.60; P T 50 , 1.22; 95% CI, 1.05 to 1.42; P =0.01). T 50 improved risk prediction (integrated discrimination improvement and net reclassification improvement, P P =0.001) of the primary composite end point. Conclusions Blood calcification propensity was independently associated with the primary composite end point, all-cause mortality, MI, and PVE in the EVOLVE study and improved risk prediction. Prospective trials should clarify whether T 50 -guided therapies improve outcomes.