The topic becomes complex when a request to refuse transfusion is based on a religious view which is seen as a doctrine. The question is then: has a government the right to overrule you religious conviction. I guess in most countries they do have the right. However, will religion then become subject to a government and gets a flavour of a state controlled religion?
If a refusal is not religious based but based on non-religious arguments, then the issue of freedom to act becomes important. In most countries, euthanasia is not allowed. Refusing blood can be considered a step towards euthanasia, I guess.
If in either case there is a minor at stake, more emotions come in play. And yes, becomes more complex for a judge.