Portal vein provides what percentage of the liver's oxygen needs?

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The liver gets its oxygen from two sources with different oxygen content: the portal venous blood provides most of the flow, but it is relatively deoxygenated, while the hepatic arterial blood is oxygen-rich but supplies a smaller share of flow. When you combine these factors, about 60% of the liver’s oxygen needs come from portal venous delivery and roughly 40% from hepatic arterial delivery. This dual-blood supply means the liver relies on a larger volume of lower-oxygen blood for most of its oxygen, with the arterial blood supplying a substantial but smaller portion of the oxygen despite its higher oxygen content.