Tests requested should take into account poison(s) taken, physiological status and comorbidities

Blood glucose, sodium, potassium, urea and creatinine

Plasma osmolality^*

Paracetamol level if paracetamol poisoning is known or possible

Full blood count

Urinalysis (myoglobinuria due to rhabdomyolysis gives a positive stick test for blood)

Arterial blood gases and pH

Chest X-ray

ECG if there is hypotension, coexistent heart disease or suspected ingestion of cardiotoxic drugs (e.g. anti-arrhythmics, tricyclics)

If the substance ingested is not known, save serum (10 mL) and urine (50 mL) at 4°C in case later analysis is needed