Systems, kits, and methods for predicting the risk of an adverse event related to acute kidney injury AKI as a consequence of a surgical intervention in a subject. Embodiments of the system and methods include means and steps for determining an amount of liver-type fatty acid binding protein (L-FABP) in a sample, such as a urine-sample of a subject; comparing the amounts of the L-FABP with a reference amount, and predicting the risk of an adverse event related to acute kidney injury as a consequence of surgical intervention in the subject.