• Arterial blood gases, pH and lactate
• ECG
• Blood glucose
• Plasma sodium, potassium, urea and creatinine
• Full blood count

Urgent

• Chest X-ray
• Echocardiography if hypotension/shock
• Cranial CT if reduced conscious level or focal signs
• Coagulation screen if low platelet count, suspected coagulation disorder, jaundice or purpura
• Biochemical profile
• Amylase if abdominal pain or tenderness
• C-reactive protein
• Blood culture if suspected sepsis
• Urine stick test
• Toxicology screen (serum 10 mL and urine 50 mL) if suspected poisoning