Some biomarkers such as liver-type fatty acid-binding protein (L-FABP) and neutrophil gelatinase-associated lipocalin (NGAL) are secreted by normal tubular cells into the urine, however, increased amounts of those biomarkers in plasma of AKI patients [10] may also increase their urinary concentration, causing misinterpretation. This evidence concerns the gene FABP1 and acute kidney injury.