The paper presents a case of woman with nephrocalcinosis confirmed 10 years ago. During her third pregnancy a renal failure occurred with increasing urinary retention in the right kidney. Conservative treatment was applied without dialysis, despite of renal biochemical parameters, which balanced on the edge of the indication for this procedure. The pregnancy was managed by the 32-nd week and then cesarean section was performed because of increasing levels of creatinine and urea in the serum and enlargement of hydronephrosis. After the delivery a recovery of renal function was observed. Patient was discharged in good general condition on 9-th day after cesarean section and baby after 52 days of hospitalization in neonatal department when she has reached weight of 3000 g.