Oxygen delivery is described by this equation:
Where Qt is the cardiac output in L per minute, and CaO2 is the oxygen content of whole blood;and where the oxygen content of whole blood is the (tiny) fraction of dissolved O2, and the product of Hb (g/L) x 1.39 (in ml, the oxygen-carrying capacity of hemoglobin), multiplied by the saturation of hemoglobin.
With a cardiac output of about 5L/min and a oxygen carrying capacity of 1.39ml O2 per 1g Hb, at a Hb of 150, and at a saturation of 100%, one can calculate that the DO2 is around 1042.5ml of O2 per minute.
But, how do you know this is adequate?
This old article is the result of a meeting where several luminaries put their heads together about what the best method is for assessing tissue oxygenation:
Haglund, U., and R. G. Fiddian-Green. "Assessment of adequate tissue oxygenation in shock and critical illness: oxygen transport in sepsis, Bermuda, April 1+ 2, 1989." Intensive care medicine 15.7 (1989): 475-477.
Gutierrez, Juan A., and Andreas A. Theodorou. "Oxygen Delivery and Oxygen Consumption in Pediatric Critical Care." Pediatric Critical Care Study Guide. Springer London, 2012. 19-38.