Urine<unk>  concentration >20mcg/L indicates toxicity
Blood levels are not considered reliable except in large exposures
Plain films may be useful in acute ingestion because<unk>  is radiopaque
Thallium toxicity
Aluminum toxicity
Organophosphate toxicity
Antimony toxicity
Salicylate toxicity
Arsenic toxicity
Methane toxicity
Barium toxicity