ABG – 1

Clinical Chemistry

A 18 year old man presents to A&E after failing his A level results

He complains of light headedness and dizzyness and the following ABG is taken.

pH7.497.35-7.45
PO222>10.6
Pa CO22.44.7-6
HCO32-2720-28
Base excess-1.6+/- 2

What is the abnormality seen on the arterial blood gas?

  • Metabolic acidosis
  • Metabolic Alkalosis
  • Respiratory Acidosis
  • Respiratory Alkalosis
  • Compensated respiratory acidosis
  • Compensated metabolic acidosis
  • Partially compensated respiratory acidosis
  • Partially compensated metabolic acidosis

Respiratory Alkalosis

Whats the pH: alkalotic therefore it must be an alkalosis.

Whats the CO2? Low.

Is the CO2 in keeping with the pH: yes so it’s the primary cause not compensation.

I.e. it’s a respiratory alkalosis