Need to have high index of suspicion
BMP
CBC
Urinalysis
CT head for cases of encephalopathy
May show diffuse cortical hyperdensity of the grey matter
Salicylate level
In the United States<unk>  subsalicylate is the most common oral compound, and up to 90% of salicylate is absorbed 
EEG
May show diffuse cortical hyperdensity of the grey matter
In the United States<unk>  subsalicylate is the most common oral compound, and up to 90% of salicylate is absorbed
Bismuth toxicity
Aluminum toxicity
Barium toxicity
Antimony toxicity
Silver toxicity
Arsenic toxicity
Hydrogen sulfide toxicity
Methanol toxicity