UCHL1 and Cognitive impairment: Serum UCH‐L1 levels on admission to hospital (Day 1 postpoisoning) were significantly higher in patients with cognitive impairment [8.51 (6.53‐10.22) ng/mL; n = 36] compared to those without [4.25 (2.57‐6.31) ng/mL; n = 171] (P < 0.001) (Figure 1).