ARMADA - Acid-base balance work-up in 6 steps by answering 6 questions:

1. A cidosis or Alkalosis?

2. R espiratory disorder? – acidosis or alkalosis – check PaCO2

3. M etabolic disorder? – acidosis or alkalosis – check HCO3

4. A nion Gap?

5. D elta AG?

6. A ssess compensation

References:

Top 10 Clinical Pearls in Acid-base Disorders. Resident and Staff Physician, Jan 2007.
Acid-base Balance Cases and Calculators
Cleveland Clinics shares their Algorithms for Medical Intensive Care Unit (ICU)
Physiological Approach to Assessment of Acid–Base Disturbances — NEJM 2014 http://buff.ly/1xt0gqR