A patient on ICU has an arterial blood gas showing: pH 7.32, PaCO2 3.5 kPa, PaO2 11 kPa, HCO3⁻ 13 mmol/L, Na⁺ 140, K⁺ 4.5, Cl⁻ 115. The anion gap is

Question

A patient on ICU has an arterial blood gas showing: pH 7.32, PaCO2 3.5 kPa, PaO2 11 kPa, HCO3⁻ 13 mmol/L, Na⁺ 140, K⁺ 4.5, Cl⁻ 115. The anion gap is calculated as: Na – (Cl + HCO3) = 140 – (115+13) = 12 (normal). What type of metabolic acidosis is this?

Accepted Answer

Mixed respiratory and metabolic acidosis

Answer

Metabolic alkalosis

Answer

Respiratory acidosis

Answer

High anion gap metabolic acidosis

Answer

Normal anion gap (hyperchloraemic) metabolic acidosis

Normal Anion Gap Acidosis — FRCA Final MCQ

A patient on ICU has an arterial blood gas showing: pH 7.32, PaCO2 3.5 kPa, PaO2 11 kPa, HCO3⁻ 13 mmol/L, Na⁺ 140, K⁺ 4.5, Cl⁻ 115. The anion gap is calculated as: Na – (Cl + HCO3) = 140 – (115+13) = 12 (normal). What type of metabolic acidosis is this?