Calculate the arterial oxygen content (CaO2) given Hb = 15 g/dL, SaO2 = 98%, PaO2 = 100 mmHg.

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Multiple Choice

Calculate the arterial oxygen content (CaO2) given Hb = 15 g/dL, SaO2 = 98%, PaO2 = 100 mmHg.

The main idea is that arterial oxygen content comes from two sources: the oxygen bound to hemoglobin and the oxygen dissolved in plasma. Use CaO2 = (Hb × 1.34 × SaO2) + (PaO2 × 0.003). Convert saturation to a decimal (SaO2 = 0.98). Hb contribution: 15 × 1.34 = 20.1 mL O2/dL, then 20.1 × 0.98 ≈ 19.698 mL/dL. Dissolved oxygen: 100 × 0.003 = 0.3 mL/dL. Sum: 19.698 + 0.3 ≈ 19.998 ≈ 20.0 mL/dL. So the arterial oxygen content is about 20 mL/dL.

The main idea is that arterial oxygen content comes from two sources: the oxygen bound to hemoglobin and the oxygen dissolved in plasma. Use CaO2 = (Hb × 1.34 × SaO2) + (PaO2 × 0.003). Convert saturation to a decimal (SaO2 = 0.98). Hb contribution: 15 × 1.34 = 20.1 mL O2/dL, then 20.1 × 0.98 ≈ 19.698 mL/dL. Dissolved oxygen: 100 × 0.003 = 0.3 mL/dL. Sum: 19.698 + 0.3 ≈ 19.998 ≈ 20.0 mL/dL. So the arterial oxygen content is about 20 mL/dL.

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