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For patients with low blood lactate levels (≤2 mmol/L), urinary L-FABP is the best splitter, with a threshold of 97.3 ng/mL. Acute kidney injury (AKI) development in patients with hyperlactatemia (>2 mmol/L) can be predicted by urinary NGAL with a threshold of 81.2 ng/mL. NGAL, neutrophil gelatinase-associated lipocalin; L-FABP, L-type fatty acid-binding protein.
