The specific anomalies mentioned above are rare and nowhere near standard procedure in all but 3 of the United States where minors may be given authority over their own medical decisions.
In a life threatening situation where blood is required for emergent stabilization, which is particularly true in acute traumatic situations, the transfusion of a minor is performed 99.9% of the time regardless of the presence of a court order.
By Ex-Parte the following day those minors are made ward of the State to ensure the preemptive decision can not be challenged. It is a system designed to ensure the power of the Court 24/7.