<prompt> All are true regarding renal changes in normal pregnancy exceptSerum creatinine decreases.GFR and Renal plasma flow increase by 50.Increase in serum bicarbonate levels.Increased placental metabolism of AVP may cause transient diabetes insipidus during pregnancy.  <response>: Serum bicarbonate levels decreased by 4 5m Eq L due to decreased renal bicarbonate threshold. 