This study examines the impact of an early biomarker-guided intervention on the development of acute kidney injury (AKI). New biomarkers indicate kidney damage in an early stage before developing acute kidney injury according to AKI Kidney Disease Improving Global Outcomes (KDIGO) Definition is detectable. The investigators want to test if it's possible to prevent AKI based on elevated urinary biomarkers. Eligible patients will be randomly assigned to two groups, a control and an intervention Group by an early nephrologic consultation. The interventional group will receive an early preventive nephrologist consultation additionally to standard care.