What should be done first if someone is bleeding heavily?

When someone is bleeding heavily, the first and most critical action is to apply direct pressure to the wound. This method is essential because it helps to stem the flow of blood and encourages clot formation, which is crucial in managing heavy bleeding. Direct pressure can significantly reduce the risk of excessive blood loss, which is vital for the victim's survival and stability until more advanced medical care is available.

While calling emergency services is important, it should ideally happen concurrently or immediately after applying pressure, rather than as the first action. Elevating the legs can assist in cases of shock or to improve blood flow to vital organs; however, it is not suitable to prioritize this before controlling the bleeding. Checking for signs of shock is also necessary but comes after addressing the immediate issue of applying pressure to the wound. Overall, focusing on direct pressure is the best immediate response in managing heavy bleeding.