Which step is NOT included in first aid treatment for a snakebite?

In first aid treatment for a snakebite, one crucial step is keeping the affected extremity at or below heart level, rather than elevating it above the heart. This helps to slow the spread of venom through the bloodstream. Keeping the victim calm is also important, as anxiety can increase heart rate and circulation, which may facilitate the venom's movement through the body. Removing constricting clothing or jewelry is advised to prevent restricted blood flow if swelling occurs. Applying a tourniquet, on the other hand, is not recommended for snakebites, as it can cause more harm than good by cutting off blood flow completely, leading to potential tissue damage. Therefore, the step of elevating the affected extremity above the heart is not included in the correct first aid treatment protocol for snakebites.