The normal CaO2 range for males is?

The normal CaO2 range for males is?

• A. 8-12 Vol%
• B. 16-20 Vol%
• C. 24-28 Vol%
• D. 10-14 Vol%

Answer: (B)

CaO2 is the amount of oxygen carried in arterial blood, determined mainly by how much hemoglobin is available to bind oxygen and how saturated that hemoglobin is, with a small contribution from dissolved oxygen. The relationship is CaO2 ≈ (1.34 × Hb × SaO2) + (0.003 × PaO2). In a healthy adult male, with normal hemoglobin and near-normal arterial saturation, CaO2 falls around 19–20 mL of O2 per 100 mL of blood. Because there’s natural variation in Hb level and SaO2, a typical reference range sits roughly at 16–20 vol%. Thus, the range 16–20 Vol% best matches normal arterial oxygen content. The other ranges are either lower or higher than what is normally encountered in healthy adults.

CaO2 is the amount of oxygen carried in arterial blood, determined mainly by how much hemoglobin is available to bind oxygen and how saturated that hemoglobin is, with a small contribution from dissolved oxygen. The relationship is CaO2 ≈ (1.34 × Hb × SaO2) + (0.003 × PaO2). In a healthy adult male, with normal hemoglobin and near-normal arterial saturation, CaO2 falls around 19–20 mL of O2 per 100 mL of blood. Because there’s natural variation in Hb level and SaO2, a typical reference range sits roughly at 16–20 vol%. Thus, the range 16–20 Vol% best matches normal arterial oxygen content. The other ranges are either lower or higher than what is normally encountered in healthy adults.