Where do we draw the line when a grown Sane adult decides he
/she will die with an infection rather than take medication which will surely heal the infection and save their life ..

In some Countries they are only allowed two children and in all Countries anyone can kill themself if they really want to . Many innocent children have died because the Parents will not allow the child a 'lifesaving' blood transfusion .

It would seem a 'Natural ' Law to save your child's life when you know you can ,

In the Bible perhaps it suggests to not take blood from another however that was when they only had so much knowledge on blood transfusions so it might seem odd back then to take another's blood .