Paediatric Severe Anaemia — Blood Transfusion Volume Nigeria · Kenya · Ghana
Weight-based packed red cell (pRBC) transfusion volume by current and target haemoglobin.
Severity grading, infusion rate, malaria-context adjustments, post-transfusion Hb target.
WHO Pocket Book 2013 · BNF for Children 2024 · BSH Guidelines 2023. Offline-capable.
For qualified healthcare professionals only.
Transfusion volume formulae give an estimate only. Clinical severity, cardiac function, speed of onset, and available blood products must all influence the final decision. Severe anaemia with cardiac failure requires slower infusion with furosemide — not a standard rate.
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Clinically reviewed by
Dr. Chioma Okafor, FWACP (Paeds)
Consultant Paediatrician, University of Nigeria Teaching Hospital
Severe anaemia is among the most common causes of paediatric hospital admission and in-hospital mortality across sub-Saharan Africa, driven primarily by malaria, nutritional iron deficiency, sickle cell disease, and hookworm infestation. Accurate blood transfusion volume calculation — balancing the need to correct life-threatening anaemia against the risk of transfusion-associated circulatory overload (TACO) — is a critical clinical skill. In malaria-endemic settings, transfusion thresholds are lower than in high-income countries: WHO recommends transfusion for Hb <5 g/dL regardless of symptoms, or Hb <7 g/dL with any sign of cardiac compromise. This calculator reflects WHO clinical transfusion guidelines and FMOH Nigeria blood transfusion protocols.
WHO recommends transfusion when Hb <5 g/dL in any child regardless of clinical signs, or Hb <7 g/dL in the presence of: respiratory distress, impaired consciousness, heart failure, or severe malaria. Higher thresholds may apply in sickle cell disease or active bleeding.
Packed red cell volume (mL) = Weight (kg) × Desired Hb rise (g/dL) × 3. Whole blood volume (mL) = Weight (kg) × Desired Hb rise (g/dL) × 6. Target an Hb rise of 2–3 g/dL initially. Infuse at 2–5 mL/kg/hr. Slow to 1 mL/kg/hr if cardiac compromise is present. Monitor closely for TACO.
Start effective antimalarial treatment concurrently with transfusion. Do not delay transfusion for antimalarial treatment to take effect. Give IV artesunate for severe malaria with Hb <7 g/dL. Pre-treat with furosemide 1 mg/kg IV before transfusion if signs of fluid overload.
TACO occurs when blood is transfused faster than the cardiovascular system can compensate, causing acute pulmonary oedema. It is particularly dangerous in severely anaemic children who are already in compensatory high-output cardiac failure. Prevention: never transfuse faster than 5 mL/kg/hour in stable severe anaemia; use 10 mL/kg packed cells over 3–4 hours. If signs of cardiac decompensation are present (gallop rhythm, respiratory distress, hepatomegaly), give furosemide 1 mg/kg mid-transfusion or transfuse only 5 mL/kg. Stop immediately if respiratory distress worsens.
Transfusion should be withheld if the child is clinically stable and haemoglobin is above 5 g/dL without signs of decompensation. In sickle cell disease, the pre-transfusion haemoglobin threshold is different and exchange transfusion may be preferred over simple transfusion to avoid hyperviscosity. In malnourished children (SAM), transfusion carries high risk of TACO and should only be given for Hb below 4 g/dL or signs of cardiac decompensation, using small volumes (5–10 mL/kg) with diuretic cover. Always weigh risks against available blood safety standards.
Related calculators
For weight-based dosing of iron supplementation and other medicines used alongside transfusion, see the Paediatric Drug Dose Calculator.
📋 Guideline basis: WHO Malaria 2015 · NICE NG24 · BNFc 2024 · Last reviewed: January 2025 · Next review due: January 2026 · Disclaimer · Report an error
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