Blood Transfusions: Indications, Components, and Safety

Blood transfusion is the intravenous administration of blood components from a donor to a recipient. It is a life-saving intervention used in specific clinical scenarios.

Common Indications

1. Acute blood loss: Trauma, surgery, postpartum hemorrhage, GI bleed – restores volume and oxygen-carrying capacity.
2. Severe anemia: Symptomatic (Hb <7–8 g/dL) or chronic (e.g., myelodysplasia, chemotherapy) – RBC transfusion.
3. Hematologic malignancies: Leukemia, lymphoma, myeloma – RBCs, platelets, plasma during treatment.
4. Thrombocytopenia: Platelet transfusion for bleeding or prophylaxis (<10–20×10⁹/L).
5. Coagulopathy: Plasma (FFP) for multiple factor deficiencies (liver disease, DIC, warfarin reversal, massive transfusion).
6. Exchange transfusion: Hemolytic disease of newborn, sickle cell crisis, severe malaria.
7. Preoperative optimization: Rare; for high-blood-loss surgeries in anemic patients.

Blood Components

• Packed Red Blood Cells (PRBCs): Oxygen delivery.
• Platelets: Hemostasis.
• Fresh Frozen Plasma (FFP): Coagulation factors.
• Cryoprecipitate: Fibrinogen, Factor VIII, vWF.
• Granulocytes: Rare, for severe neutropenic sepsis unresponsive to antibiotics.

Safety

• Rigorous donor screening, nucleic acid testing (HIV, HBV, HCV, WNV, Zika, etc.).
• ABO/Rh compatibility mandatory.
• Leukoreduction (standard) reduces febrile reactions, HLA alloimmunization, CMV transmission.
• Transfusion reactions: febrile non-hemolytic, allergic, TRALI, TACO, hemolytic (acute/delayed), infection (extremely rare).

Transfusions are prescribed only when benefits outweigh risks, per evidence-based guidelines (AABB, ASA).