Calculate blood product doses for children: pRBC, platelets, FFP, and cryoprecipitate. Includes estimated blood volume, infusion rates, and expected response.
Blood product transfusion in children requires precise volume calculations based on weight, estimated blood volume, and the desired hemoglobin or platelet count increment. The Pediatric Transfusion Calculator provides dosing guidance for packed red blood cells (pRBC), platelets, fresh frozen plasma (FFP), cryoprecipitate, and whole blood. It is structured to help translate the ordered product into a weight-based volume estimate.
Unlike adult transfusion where standard units are typically ordered, pediatric doses must be calculated based on the child weight — a 5 kg infant needs an entirely different volume than a 50 kg adolescent. Over-transfusion risks include transfusion-associated circulatory overload (TACO), while under-transfusion fails to achieve therapeutic goals.
This calculator estimates blood volume using age-appropriate mL/kg values, calculates the precise volume needed to reach hemoglobin or platelet targets, determines appropriate infusion rates, and provides a quick-reference table for all major blood products. It supports clinical decision-making while reinforcing that all transfusion decisions require physician judgment. Check the example with realistic values before reporting.
Pediatric transfusion dosing errors can have serious consequences. This calculator provides weight-based dosing that accounts for age-specific blood volume differences, helping clinicians avoid both over- and under-transfusion. Having quick access to standard doses, expected responses, and infusion rate calculations improves efficiency in the hospital setting and supports standardized transfusion practices.
Estimated Blood Volume (EBV): Neonate = 85-90 mL/kg, Infant = 80 mL/kg, Child = 70-75 mL/kg pRBC Volume (mL) = (Target Hb - Current Hb) × Weight × 3 Standard pRBC dose: 10-15 mL/kg raises Hb ~2-3 g/dL Platelet dose: ~1 unit per 10 kg body weight FFP dose: 10-15 mL/kg Cryoprecipitate: 1 unit per 5 kg body weight
Result: 135 mL pRBC volume
A 15 kg child with Hb of 7 g/dL targeting 10 g/dL: (10 - 7) × 15 × 3 = 135 mL of pRBC. At 3 mL/kg/hr (45 mL/hr), this infuses over about 3 hours.
Accurate blood volume estimation is the foundation of pediatric transfusion dosing. Blood volume per kilogram decreases with age: premature neonates have approximately 90 mL/kg, term neonates 85 mL/kg, infants 80 mL/kg, and children/adolescents 70-75 mL/kg. These differences reflect the higher proportional blood volume in smaller patients.
For obese patients, using ideal body weight may be more appropriate than actual weight. An individually measured blood volume (using radioisotope dilution) is the gold standard but is rarely performed in clinical practice.
Restrictive transfusion strategies have gained evidence support in pediatrics. The TRIPICU trial demonstrated that a hemoglobin threshold of 7 g/dL was safe for stable critically ill children, reducing transfusion rates without adverse outcomes. However, specific populations—including neonates, children with cyanotic heart disease, and those with active hemorrhage—may benefit from higher thresholds.
Platelet transfusion thresholds vary by clinical scenario: <10,000/µL for stable patients, <20,000 for fever or infection, <50,000 for minor procedures, and <100,000 for neurosurgery or active bleeding.
Neonatal transfusion has unique challenges. Small aliquots from a single donor unit reduce the number of donor exposures. CMV-negative or leukoreduced products are preferred for neonates. Irradiation is required for intrauterine transfusions and immunocompromised patients. Exchange transfusion for severe hyperbilirubinemia uses double-volume exchange (2 × EBV) with reconstituted whole blood.
General thresholds: Hb <7 g/dL for stable patients, <10 g/dL for acute hemorrhage or symptomatic anemia. Neonates and those with cyanotic heart disease may have higher thresholds.
Usual rate is 2–5 mL/kg/hr for pRBC. In emergencies, rates up to 10–15 mL/kg can be given as rapid bolus. Platelets and cryo are typically infused over 30–60 minutes.
Neonates have a higher blood volume per kilogram (~85-90 mL/kg) due to proportionally larger blood volume relative to body mass. This decreases to ~70 mL/kg by adolescence.
Irradiated products are required for immunocompromised children, intrauterine transfusions, and directed donations from blood relatives to prevent transfusion-associated graft-versus-host disease. Use this as a practical reminder before finalizing the result.
Watch for fever, chills, urticaria, tachycardia, hypotension, respiratory distress, or hemoglobinuria. Stop the transfusion immediately if a reaction is suspected.
Post-transfusion hemoglobin check is typically performed 1–4 hours after completion. A 10 mL/kg dose typically raises hemoglobin by approximately 2 g/dL.