In blood transfusion establishments, the persons listed in article R. 1222-21 may take venous or capillary blood samples from the ear lobule, fingertips, elbow, back of the hand and malleolar region, with a view to medical biology examinations and on medical prescription. These samples are taken either under the supervision of a doctor, or under the supervision of the head of the blood establishment laboratory, who, if not a doctor, must be authorised to take samples.