quellycatface - In the UK minors are never exposed to any medical crisis involving blood. The court will issue a "ward of court" order and authorise the doctors to do whatever is medically necessary. This has been the case for many years.
There was a non JW mother refusing chemo for her child because she had been influenced by a lot of internet bullshit. The court over-ruled her.
The only complication comes with young teens where the court may have to make a ruling on competence.
As a 15 year old I could have convinced a judge it was my own decision. Teenagers need to be protected from themselves.