<qa>  What is the height of FGF23 in the blood plasma linked with?For determining the prognosis of heart and kidney-failure patients, biomarkers are analyzed. Biomarkers in the blood or urine which can provide early information on a specific course of disease are called prognostic biomarkers. In this study, prognostically relevant biomarkers for cardiovascular renal insufficiencies will be clinically evaluated, to improve the course of assessment of such disease and to gain new insights into the typical course of congestive heart failure. This is a prerequisite to allow patients to appropriate treatment as soon as possible. An important role in heart and vascular disease can be awarded the Fibroblast growth factor 23 FGF 23. The height of FGF23 in the blood plasma is linked with the risk of cardiovascular events occur and the beginning of dialysis patients. FGF23 goes hand in hand with the development of heart failure or with a hospitalization as a result of heart failure. 