Laboratory
Finger stick glucose (to rule out hypoglycemia)
Acetaminophen and Salicylate level
Urine Drug Screen (to verify toxic substance, do not delay treatment for results)
Serum electrolytes
Serum creatine phosphokinase
Creatinine and BUN
Urine analysis with myoglobin
Arterial or venous blood gas if respiratory symptoms present
Cardiac
ECG for prolongation of QTc or QRS intervals
Sympathomimetic toxicity
Infectious
Anticholinergic toxicity
Sepsis
Clonidine toxicity
Meningitis
Mescaline toxicity
Encephalitis