Approach to Acid-Base Disorders%u2022 Step 1: Identify the primary disorder%u2022 Step 2: Calculate anion gap if metabolic acidosis%u2022 Step 3: Assess compensation%u2022 Step 4: Consider mixed disorders%u2022 Key investigations:%u2022 Arterial blood gas%u2022 Serum electrolytes%u2022 Urinalysis