A patient presents with a serum bicarbonate level of 18 mEq/L and a pH of 7.32. What is the most likely acid-base disturbance in this patient?

A Metabolic acidosis with respiratory alkalosis
B Respiratory acidosis with metabolic alkalosis
C Metabolic acidosis with no respiratory compensation ✓
D Respiratory alkalosis with metabolic acidosis

Explanation

The patient's serum bicarbonate level is low (normal range: 22-28 mEq/L), and the pH is slightly acidic (normal range: 7.35-7.45). This suggests a metabolic acidosis with no respiratory compensation.

Source

Harrison's Principles of Internal Medicine
Electrolytes and Acid-Base Balance Acid-Base Balance Metabolic Acidosis Hard MEDICAL Confidence: high