superficial partial-thickness burn
1st degree; involves epidermis and part of dermis, little/none blister formation
deep partial-thickness burn
2nd degree; epidermis and part of dermis with blister formation, skin sloughs off
full thickness burn
3rd degree; destruction of all skin layers and often underlying tissue, eschar and nerve damage
Major burns
any burn of face, hands, feet, perineum
>20% total body surface area (TBSA)
all full thickness burns