Holby City's Rosie Marcel told fans she called upon her knowledge from the BBC show to help a man she found bleeding the street.
The actress, 45, who played surgeon Jac Naylor in the programme, was in the car with her daughter when she saw the stranger covered in blood.
Taking to Instagram on Saturday with a picture of the man huddled under a blanket at the side of the road, she said: "Yesterday on my way to visit my parents in law we were driving along and saw this man walking covered in blood.
