Blood Products and Transfusion Principles

Core Concepts

Blood products and what each one replaces

• Packed red blood cells (PRBCs): red cells concentrated from donated whole blood. They restore oxygen-carrying capacity in anemia, acute blood loss, or when a patient's own production is inadequate.
• Platelets: cell fragments essential to clot formation. Given to patients with severe thrombocytopenia or platelet dysfunction who are bleeding or at high bleeding risk.
• Fresh frozen plasma (FFP): contains clotting factors. Used when multiple clotting factors are deficient, such as in significant bleeding with coagulopathy.
• Cryoprecipitate: the cold-precipitated fraction of plasma, rich in specific clotting factors (fibrinogen among them). Used in specific factor-deficiency situations.
• Albumin: a plasma protein that holds fluid in the vascular space; used in some volume-expansion situations.
• Whole blood: rarely used in modern practice; components are preferred because they target therapy precisely and conserve the donor's gift.

Exact indications, thresholds, and dosing are determined by providers following current evidence and institutional protocols — nurses administer and monitor, they do not prescribe.

Compatibility: why matching matters

Red blood cells carry surface markers (antigens). The ABO system is the most important: a person with type A blood has A antigens and makes antibodies against B; type B makes antibodies against A; type AB makes neither; type O makes both. The Rh system adds another marker (positive or negative). The rule to remember: the recipient's antibodies must not attack the donor's red cells. Giving incompatible blood triggers an acute hemolytic reaction — the recipient's immune system destroys the donor cells — which can be catastrophic. That is why blood is type and crossmatched before transfusion, and why the bedside compatibility check is non-negotiable: the nurse verifies the match the blood bank has approved.

The transfusion process: verification and monitoring

Every facility has a detailed transfusion policy, and the nurse follows it exactly. The common safety skeleton taught in nursing programs includes:

1. Provider order and consent: transfusion requires a provider order and, per facility policy, informed consent.
2. Pre-transfusion verification: a two-person (or barcode-based) check of the patient's identity and the blood product — comparing the patient's ID band, the product label, and the compatibility slip. Identity errors, not blood bank errors, cause most wrong-blood events.
3. Baseline vital signs are taken before starting.
4. Start slowly and observe closely: the first minutes of the transfusion are when serious reactions most often begin; the patient is observed closely during this period, commonly described as the first 15 minutes, per facility policy.
5. Ongoing monitoring: vital signs are repeated at intervals per policy, and the patient is assessed for chills, fever, itching, shortness of breath, back pain, or flushing.
6. Documentation: product, verification, vital signs, and patient response are documented in the medical record.

Recognizing and responding to transfusion reactions

Reactions are classified by mechanism and timing. Common categories taught to nurses include:

• Acute hemolytic reaction: incompatible red cells destroyed by the recipient's antibodies; a medical emergency with fever, chills, back/flank pain, and hypotension. Most often due to administration error.
• Febrile non-hemolytic reaction: fever and chills without red cell destruction; the most common reaction, usually from antibodies against donor white cells.
• Allergic reaction: hives and itching from antibodies to plasma proteins; anaphylaxis is the severe form, with breathing difficulty and hypotension.
• Transfusion-associated circulatory overload (TACO): too much volume too fast, causing dyspnea, hypertension, and pulmonary congestion — a risk especially in patients with heart or kidney disease.
• Transfusion-related acute lung injury (TRALI): a rare, serious reaction causing acute respiratory distress.

The first action for any suspected reaction is the same: stop the transfusion, keep the IV line open with saline (per policy), notify the provider, and follow the facility's reaction protocol — which typically includes returning the product and tubing to the blood bank for investigation. The nurse never "just slows it down and watches" when a reaction is suspected.

Common Confusions