Blood transfusion is the process of receiving blood products into one's circulation intravenously. Transfusions are used in a variety of medical conditions to replace lost components of the blood. Early transfusions used whole blood, but modern medical practice commonly uses only components of the blood, such as red blood cells, white blood cells, plasma, clotting factors, and platelets.
They are typically only recommended when a person's hemoglobin levels fall below 8g/dL. One may consider transfusion for people with symptoms of cardiovascular disease such as chest pain or shortness of breath. Globally around 85 million units of red blood cells are transfused in a given year. In cases where patients have low levels of haemoglobin but are cardiovascularly stable, parenteral iron is increasingly a preferred option based on both efficacy and safety.
Read more about Blood Transfusion: Pre-transfusion Procedures, Adverse Effects, In Other Animals, Blood Substitutes
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“Put on the whole armor of God, so that you may be able to stand against the wiles of the devil. For our struggle is not against enemies of blood and flesh, but against the rulers, against the authorities, against the cosmic powers of this present darkness, against the spiritual forces of evil in the heavenly places.”
—Bible: New Testament, Ephesians 6:11-12.