Citations are important for a journal to get impact factor. Impact factor is a measure reflecting the average number of citations to recent articles published in the journal. The impact of the journal is influenced by impact factor, the journals with high impact factor are considered more important than those with lower ones. Impact factor plays a major role for the particular journal. Journal with higher impact factor is considered to be more important than other ones. Impact factor can be calculated as average number of citation divided by recent cited articles published in 2 years. A blood transfusion is a way of adding blood to your body after an illness or injury. If your body is missing one or more of the components that make up healthy blood, a transfusion can help supply what your body is missing. Depending on how much blood you need, a transfusion can take between 1 and 4 hours. About 5 million Americans need a blood transfusion every year, and the procedure is usually safe. Your blood is made up of several different parts including red and white cells, plasma, and platelets. “Whole blood” refers to blood that has all of them. In some cases, you may need to have a transfusion that uses whole blood, but it’s more likely that you’ll need a specific component. When you get a transfusion, the blood you’re given has to work with the type of blood you have (either A, B, AB, or O). Otherwise, antibodies in your own blood will attack it, and cause problems. That’s why blood banks screen for blood type, Rh-factor (positive or negative), as well as anything that can cause infection. About 40% of people have type O blood, which is safe to give almost anyone in a transfusion. If you have type O blood, you’re called a universal donor. If you have type AB blood, you can receive any type of blood and you’re called a universal recipient. If you have Rh-negative blood, you can only receive Rh-negative blood. This is a rare, but potentially fatal reaction. It shows up within hours of the start of the transfusion in the form of a fever and low blood pressure. TRALI damages your lungs. It may be caused by antibodies or other substances in the new blood. Even though it’s rare, it’s still the leading cause of transfusion-related death in the United States. A blood transfusion is a common, safe medical procedure in which healthy blood is given to you through an intravenous (IV) line that has been inserted in one of your blood vessels. Four types of blood products may be given through blood transfusions: whole blood, red blood cells, platelets, and plasma. Most of the blood used for transfusions comes from whole blood donations given by volunteer blood donors. A person can also have his or her own blood collected and stored a few weeks before surgery in case it is needed. Blood transfusions are usually very safe, because donated blood is carefully tested, handled, and stored. However, there is a small chance that your body may have a mild to severe reaction to the donor blood. Other complications may include fever, heart or lung complications, alloimmunization, and rare but serious reactions in which donated white blood cells attack your body’s healthy tissues. Some people have health problems from getting too much iron from frequent transfusions. There is also a very small chance of getting an infectious disease such as hepatitis B or C or HIV through a blood transfusion. For HIV, that risk is less than one in 1 million. Scientific research and careful medical controls make the supply of donated blood very safe. Blood transfusions are among the most common medical procedures in the nation.