红血球
Red blood cell transfusion is common for people undergoing hip fracture surgery due to the blood loss sustained during surgery and from the injury. Giving blood when the hemoglobin is less than 10 g/dL versus less than 8 g/dL was of unclear benefit per a 2015 Cochrane review. A review in 2018 however found that waiting until the hemoglobin was less than 8 g/dL or the person had symptoms increased the risk of heart problems.