GPT and nephrocalcinosis: Baseline plasma ionized calcium [iCa] (OR = 2.57 [95% CI: 1.20–8.91] per 0.1 mmol/L increase; P = 0.012), phosphate (OR = 1.59 [95%CI: 1.00–3.04] per 0.1 mmol/L increase; P = 0.049), creatinine (OR = 1.33 [95% CI: 1.03–2.01] per 10 μmol/L increase; P = 0.015) and ALT activity (OR = 2.08 [95% CI: 1.04–5.61] per 10 U/L increase; P = 0.036) were independent risk factors for nephrocalcinosis.