⚠️ Suspected transfusion reaction: 🚫 Stop the transfusion immediately → Maintain IV access with saline → Assess ABCs → Check patient identity & blood unit → Inform the laboratory and seek specialist advice.

💉 About

☎️ In urgent situations, contact the transfusion laboratory directly.
🧪 Always send a fresh group & screen / cross-match sample as soon as transfusion is anticipated.

📌 Introduction

🩸 Red cell transfusion increases oxygen-carrying capacity but does not treat the underlying cause of anaemia.
Blood is scarce, costly, and associated with significant risks - transfuse only when benefit outweighs harm.
Standard adult unit = red cell concentrate (≈280–350 mL).
📈 One unit typically raises Hb by ~10 g/L in adults.
✅ Fully cross-matched blood is preferred and usually available within ~40 minutes of sample receipt.

🧠 Pathophysiology (Why We Transfuse)

Haemoglobin transports oxygen to tissues; severe anaemia reduces oxygen delivery (DO₂ = CO × arterial O₂ content).
Compensation occurs via ↑ cardiac output and ↑ oxygen extraction, but this fails in severe anaemia or limited cardiac reserve.
Transfusion improves oxygen delivery immediately, but does not replenish iron, B12, or correct marrow failure.
Over-transfusion increases blood viscosity, preload, and inflammatory risk without added benefit.

🛡️ Safe Group & Save / Transfusion

Correct patient identification is critical: misidentification is the leading cause of fatal transfusion errors.
Patients must wear an ID band with name, DOB, and unique hospital number.
💳 Check patient identity against the blood pack at every step - any discrepancy = do not transfuse.
👀 Close monitoring during transfusion is essential, particularly during the first 15 minutes.

🚨 Clinical Urgency

Very urgent (life-threatening haemorrhage):Give O Rh(D)-negative blood immediately (usually stored in ED / ITU). Activate massive transfusion protocol if indicated.
Urgent (5–10 minutes):Send urgent sample → issue ABO- and Rh(D)-compatible blood.
Non-urgent (30–60 minutes):Full compatibility testing → fully cross-matched blood issued.

🔄 Further Transfusions

➡️ New compatibility sample required if >72 hours since last cross-match.
➡️ Within 72 hours, repeat sample usually not required (unless clinical change or transfusion reaction).

🗓️ Non-Emergency / Elective Transfusion

⏳ Chronic anaemia without bleeding → transfuse slowly (2–4 hours per unit).
❤️ Reduced cardiac reserve / elderly → consider slower rates (up to 4 hours) ± diuretic (e.g. furosemide between units).
Acute blood loss: >20% circulating volume (~1 L) → urgent transfusion and haemorrhage control.

🎯 Indications & Thresholds (Restrictive Strategy – UK Practice)

Stable, non-bleeding adults:Consider transfusion when Hb ≤70 g/L.
Cardiovascular disease / ACS:Consider transfusion when Hb ≤80 g/L or earlier if ischaemic symptoms.
Any Hb:Transfuse if there is life-threatening anaemia (syncope, myocardial ischaemia, heart failure, shock).
Hb 80–100 g/L:Investigate cause and treat (e.g. iron, B12). Transfuse only if clear symptoms attributable to anaemia.
Hb ≈100 g/L: Transfusion rarely indicated; optimise medical management instead.

🧠 Teaching pearl:Transfuse for oxygen delivery failure, not for numbers alone. Always reassess after each unit (“one unit, then review”).

The content on this website is provided for educational and informational purposes only to support exam preparation (e.g., MLA, MRCP, USMLE) and learning. This is NOT medical advice, diagnosis, treatment, or professional guidance. It does not replace consultation with a qualified healthcare professional, official guidelines (e.g., NICE, GMC, BNF), or supervised clinical practice. Always verify information with current, authoritative sources. Makindo and its contributors accept no liability for any reliance on this content, including errors, omissions, or any resulting harm, loss, or consequences. By using this site, you agree to these terms.

Blood transfusion