Final answer:
When a tourniquet is applied due to significant bleeding, it's critical to reach a hospital within four to six hours and consult with the medical director if delayed. Significant blood loss is considered to be at least 500 ml, and children are measured at 7 ml/kg of body weight.
Step-by-step explanation:
If you have not reached a hospital within four to six hours of a tourniquet application, it is recommended to consult with the receiving medical director. In situations where significant bleeding occurs, such as a risk of blood loss of at least 500 ml (or 7 ml/kg of body weight in children), the early application of a tourniquet is critical to prevent life-threatening blood loss.
However, prolonged application of a tourniquet can lead to tissue damage, so it is essential to reach medical care promptly for further treatment and possible blood transfusions with appropriate access and fluids if the blood loss is significant.