What is the pH of blood in the umbilical artery?

The pH of blood in the umbilical artery is typically around 7.35. This value is important because it reflects the acid-base balance of the fetal blood. In the context of fetal physiology, maintaining a pH in this range is crucial for optimal oxygen transport and utilization, especially in the context of the unique metabolic demands of the fetus.

The slightly lower pH compared to that of normal adult arterial blood (which is approximately 7.4) can be attributed to the presence of carbon dioxide and lactic acid, which can accumulate in the fetal circulation, leading to a more acidic environment. This is normal and reflects the difference in respiratory and metabolic processes between the fetus and the mother.

Maintaining the correct pH is essential for fetal health, as deviations can affect oxygen delivery to tissues and can be indicative of underlying metabolic or respiratory issues. Therefore, a pH of 7.35 in the umbilical artery blood is consistent with normal fetal physiology.