It is not permissible to
draw blood from the body of a patient as a way of learning and training, even if their illness is incurable. This may harm them and will be an injustice towards them. As for those who are conscious and permit you to take blood from them for the benefit of others, this is permissible provided it will not harm them.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.