In the final multivariable model (n = 36), plasma concentrations of iCa (OR, 1.27; 95% CI, 1.05‐1.73) per 0.1 mg/dL increase (P = .01), phosphate (OR, 1.16; 95% CI, 1.00‐1.43) per 0.1 mg/dL increase (P = .05), and creatinine (OR, 1.29; 95% CI, 1.03‐1.85) per 0.1 mg/dL increase (P = .02) and ALT activity (OR, 2.08; 95% CI, 1.04‐5.61) per 10 U/L increase (P = .04) remained independent risk factors for ultrasound‐diagnosed nephrocalcinosis. The gene discussed is GPT; the disease is nephrocalcinosis.