<prompt> Renal replacement therapy replaces all except -Endocrine functionUrine outputBlood biochemistryUltrafiltration  <response>: Renal replacement therapy does not replace the endocrine and metabolic functions of the kidney . It maintains plasma biochemistry uraemic toxins, electrolytes acid base It also removes fluid from the circulation ultrafiltration to maintain the plasma volume. Ref Harrison20th edition pg 290 