"Autologous" refers to something that comes from the same individual. In medical contexts, it often describes procedures or treatments that use a person's own cells or tissues. For example, in an autologous blood transfusion, a patient donates their own blood before surgery, which can then be returned to them during or after the procedure. This approach reduces the risk of complications associated with using blood from donors. In addition to blood, autologous techniques can apply to other areas, such as stem cell therapy. Here, a patient's own stem cells are harvested and then reintroduced to help treat conditions like certain cancers or injuries. Using one's own biological material can enhance the effectiveness of treatments and minimize the risk of rejection.