Is supine positioning good for a pregnant lady?

• A. Yes
• B. No because it decreases uteroplacental blood flow and fetal oxygen
• C. It depends on gestational age
• D. It improves fetal oxygen delivery

Answer: (B)

When a pregnant person lies on their back, the growing uterus can press on major vessels like the inferior vena cava. That compression reduces venous return to the heart, lowers cardiac output, and decreases blood flow to the uterus and placenta. With less placental perfusion, the fetus receives less oxygen, increasing the risk of fetal hypoxia. This is why supine positioning is not good, especially in later pregnancy; shifting to a left lateral tilt relieves the compression and improves both maternal hemodynamics and fetal oxygen delivery. In early pregnancy the effect is less pronounced, but the preferred position remains one that avoids vena caval compression.