No significant differences in the concentrations of both urinary markers of tubular injury were observed between patients with mild and more severe AP throughout the study (Figure 1C,D), although day 1 (p = 0.06) and day 2 (p = 0.07) concentrations of L-FABP tended to be higher in patients with moderately severe AP and SAP as compared with mild AP. Here, FABP1 is linked to alkaline phosphatase measurement.