Urine<unk>  level
ECG to eval for QT Prolongation in acute exposure
CBC and retic count, expect hemolytic anemia
BMP, Mg, Phos, Ca, LFTs, CK
Type and screen for possible transfusion in arsine gas exposure
CXR if respiratory symptoms 
Consider other ingestion labs including acetaminophen and salicylate level in intentional ingestions
Urine<unk>  level (usual normal level is <50mcg/L); both urine spot test and 24h urine collection
Lab must differentiate inorganic from organic<unk>  (treat for inorganic exposure only)
Blood<unk>  level not helpful (cleared within 2 hrs of exposure)
Lab must differentiate inorganic from organic<unk>  (treat for inorganic exposure only)
Arsenic toxicity
Aluminum toxicity
Mercury toxicity
Antimony toxicity
Methane toxicity
Mold toxicity
Barium toxicity
Gold toxicity