CaO2 range is:

CaO2 range is:

• A. 17-20%
• B. 8-12%
• C. 25-30%
• D. 10-15%

Answer: (A)

CaO2 is the amount of oxygen carried by arterial blood, combining oxygen bound to hemoglobin and the small amount dissolved in plasma. In a healthy person, CaO2 is typically about 17–20 mL of O2 per deciliter of blood. This comes from the fact that hemoglobin carries most of the oxygen (roughly 15 g/dL Hb × 1.34 mL O2 per g × SaO2 near 1) giving about 19–20 mL/dL, with only a small additional amount dissolved (PaO2 × 0.003). Therefore the normal range is around 17–20 mL O2/dL, which matches the 17–20 option. If Hb is low or SaO2 is reduced, CaO2 drops outside this range.

CaO2 is the amount of oxygen carried by arterial blood, combining oxygen bound to hemoglobin and the small amount dissolved in plasma. In a healthy person, CaO2 is typically about 17–20 mL of O2 per deciliter of blood. This comes from the fact that hemoglobin carries most of the oxygen (roughly 15 g/dL Hb × 1.34 mL O2 per g × SaO2 near 1) giving about 19–20 mL/dL, with only a small additional amount dissolved (PaO2 × 0.003). Therefore the normal range is around 17–20 mL O2/dL, which matches the 17–20 option. If Hb is low or SaO2 is reduced, CaO2 drops outside this range.