Uric acid has a positive correlation with systolic blood pressure, pulmonary arterial pressure, creatinine, ferritin, anti-ANA, proteinuria with r = 0.188; 0.242; 0.476; 0.265; 0.206; 0.226 (p<0.05) and negatively correlated with glomerular filtration rate, urinary pH, hemoglobin, protein, C3 with r = - 0.457; - 0.241; - 0.204, - 0.261, - 0.331 (p<0.05).