Brief Answer: Need few answers. Detailed Answer: Hello, There are plenty of factors involved in prognosis of healing of Stab Wound. First thing you have not mentioned about where he had the stab wound? If it is in vital areas like abdomen and chest area and also deep, he need emergency treatment. Further if there is any damage to blood vessels like arteries and veins, then bleeding will be more and it have to be controlled. Waiting for your response.