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Basal prolactin concentrations in forty-eight children with acute or chronic renal disease have been compared with those in thirty-four healthy control subjects. Elevated basal prolactin levels and an abnormal prolactin response to intravenous thyrotropin-releasing hormone were found in children with chronic renal failure on maintenance intermittent haemodialysis. No significant change in plasma prolactin concentrations and osmolality was observed before and after haemodialysis, despite a fall in plasma creatinine concentrations. The elevated prolactin levels fell to normal in three patients after successful renal transplantation. It is suggested that the kidney has an important role to play in prolactin metabolism.