Which blood gas result will the nurse expect to observe in a patient with respiratory alkalosis?
a. pH 7.60, PaCO2 40 mm Hg, HCO3– 30 mEq/L
b. pH 7.53, PaCO2 30 mm Hg, HCO3– 24 mEq/L
c. pH 7.35, PaCO2 35 mm Hg, HCO3– 26 mEq/L
d. pH 7.25, PaCO2 48 mm Hg, HCO3– 23 mEq/L
ANS: B
Respiratory alkalosis should show an alkalotic pH and decreased CO2 (respiratory) values, with a normal HCO3–. In this case, pH 7.53 is alkaline (normal = 7.35 to 7.45), PaCO2 is 30 (normal 35 to 45 mm Hg), and HCO3– is 24 (normal = 22 to 26 mEq/L). A result of pH 7.60, PaCO2 40 mm Hg, HCO3– 30 mEq/L is metabolic alkalosis. pH 7.35, PaCO2 35 mm Hg, HCO3– 26 mEq/L is within normal limits. pH 7.25, PaCO2 48 mm Hg, HCO3– 23 mEq/L is respiratory acidosis.
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