Which of the following variables are measured directly by a blood gas machine? 1. pH 2. PaO2 3. HCO3– 4. SaO2
a. 1 and 2 c. 3 and 4
b. 2 and 3 d. 1 and 4
ANS: A
The pH is measured directly by using a Sanz electrode. The PaO2 is measured directly by using a Clark electrode. The HCO3– is derived from measurements of pH and PaCO2 is derived by using the Henderson-Hasselbalch equation. The saturation of hemoglobin can be calculated by using an equation empirically derived from the oxyhemoglobin saturation curve.
Health Professions
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