Gynaecology & Obstetrics With increasing gestational age, the S/D (Systolic / Diastolic ratio) of umbilical aery … A Increases B Decreases C Shows a persistent diastolic notch D Remains constant 💡 Explanation With increasing gestational age, the S/D (Systolic / Diastolic ratio) of umbilical aery ... ✓ Correct Answer: B. Decreases