An ABG result shows pH of 7.35, PaCO2 of 30 mm Hg, and HCO3– of 18 mEq/L. Which of the following is the patient's most likely primary disorder?
a. Metabolic acidosis
b. Metabolic alkalosis
c. Respiratory acidosis
d. Respiratory alkalosis
ANS: A
In cases in which compensation has occurred, if the pH is on the acidic side of 7.40 (7.35 to 7.39), the component that would cause an acidosis (either increased PaCO2 or decreased plasma HCO3–) is generally the primary cause of the original acid-base imbalance.
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