Gynaecology & Obstetrics General dc6e3483 All are true regarding renal changes in normal pregnancy except A Serum creatinine decreases. B GFR and Renal plasma flow increase by 50%. C Increase in serum bicarbonate levels. D Increased placental metabolism of AVP may cause transient diabetes insipidus during pregnancy. High-Yield Explanation Serum bicarbonate levels decreased by 4 → 5m Eq / L due to decreased renal bicarbonate threshold.