Pathology Which of the following ranges of haemoglobin O2 saturation from systemic venous to systemic aerial blood represents a normal resting condition? A 25 to 75% B 40 to 75% C 40 to 95% D 75 to 98% 💡 Explanation Which of the following ranges of haemoglobin O2 saturation from systemic venous to systemic aerial blood represents a normal resting condition? ✓ Correct Answer: D. 75 to 98%