Grade I or II envenomation may generally be discharged after 6 hours of observation in the ED without progression of symptoms.
Grade III or IV envenomation likely requires antivenom administration and/or admission.
Scorpion envenomation
Hymenoptera stings 
Stonefish envenomation
Mammalian bites
Fire coral envenomation
Closed fist infection 
Lionfish envenomation
Dog bite