Which of the following ABG values represents uncompensated metabolic acidosis?
a. pH, 7.29; PaCO2, 57 mm Hg; HCO3–, 22 mEq/L
b. pH, 7.36; PaCO2, 33 mm Hg; HCO3–, 18 mEq/L
c. pH, 7.22; PaCO2, 42 mm Hg; HCO3–, 18 mEq/L
d. pH, 7.52; PaCO2, 38 mm Hg; HCO3–, 29 mEq/L
C
A pH of 7.22 is below normal, reflecting acidosis. The metabolic component (HCO3–) is low, indicating that the acidosis is metabolic in origin. Uncompensated metabolic acidosis values include a pH below 7.35, PaCO2 of 35 to 45 mm Hg, and HCO3– below 22 mEq/L
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