Abstract
Blood donation is the process of channeling blood or blood elements from one person to another's circulatory system. Many people don't know about the benefits of blood donation for health. Even though by making a blood donor, the blood cells in the body become more quickly replaced with new ones. With the increasing demand for blood supply in the community, adequate blood supply is needed. So from that this research was conducted to find out how much the number of blood requests per month by applying the Tsukamoto fuzzy method and having 3 variables, namely donors, supplies, requests. Data taken through the Indonesian Red Cross (PMI) in the city of Pematangsiantar. The results of this study indicate that the Indonesian Red Cross (PMI) Pematangsiantar can make monthly requests for blood more or less is 380 bags of blood.
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