Daily Exam Question - Feb. 20 2014 - Fetal Circulation

In the fetal maternal circulation, where is the highest pa02 found?

A. Uterine Artery

B. Umbilical Artery

C. Umbilical vein

D. Hypogastric artery

E. Uterine Vein

Answer: A

Williams Obstetrics 23rd Edition - Page 89-90

With regard to fetal circulation:

Maternal Uterine Artery PO2 ~ 90-100 > Umbilical Artery PO2 ~ 20

Maternal Uterine Vein PO2 ~40mmHg   > Umbilical Vein PO2 ~30mmHg

Umbilical Vein PO2 ~30 - 35mmHg   > Umbilical Artery PO2 ~20mmHg