Blood Bank & Transfusion Medicine
Every blood bank & transfusion medicine calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
20 calculators in this section
- ABC Score for Massive Transfusion CalculatorFour bedside items, available within minutes of arrival and needing no laboratory result, that predict whether a trauma patient will need a massive transfusion. Two or more means activate.
- ABO and RhD Compatibility CheckerCheck a donor unit against a recipient for ABO and RhD with the component type as an input — because red cells and plasma have opposite rules and platelets have a third set. Group O red cells are the universal donor; group AB plasma is. This is not a crossmatch and not the bedside check.
- Anti-D Immunoglobulin Dose CalculatorCalculate the anti-D dose for a measured fetomaternal haemorrhage under either convention. The UK figure is per mL of fetal red cells and the US figure per mL of fetal whole blood — crossing them under- or over-doses.
- Corrected Count Increment (CCI) CalculatorWork out whether a platelet transfusion actually worked. Enter counts in the unit your laboratory reports — the ×10⁹/L to /µL conversion the formula needs is done inside the calculator.
- Crossmatch to Transfusion Ratio CalculatorThe oldest measure of blood ordering efficiency, with the transfusion probability alongside it. A ratio above 2 means units are being reserved and returned rather than used.
- Cryoprecipitate Dose for Fibrinogen CalculatorWork out how many packs are needed to reach a target fibrinogen — for a single donation, a five-donation pool or a vial of fibrinogen concentrate, because the three differ three- to fivefold in what they contain.
- Estimated Blood Volume Calculator (Nadler)Estimate total blood volume from height, weight and sex using Nadler's equations — the standard for apheresis and exchange transfusion planning.
- Factor IX Dose CalculatorDose factor IX replacement in haemophilia B. The coefficient is not the one used for factor VIII, and it is not the same for plasma-derived and recombinant products — the wrong choice underdoses by half or by a quarter.
- Factor VIII Dose CalculatorDose factor VIII replacement in haemophilia A from weight and the rise you need, with the target peak levels the WFH sets for each type of bleed — and the response that should make you think of an inhibitor.
- Fresh Frozen Plasma (FFP) Dose CalculatorSize an FFP dose from weight at 10, 15 or 20 mL/kg — and check the indication first, because a mildly raised INR in a patient who is not bleeding is the commonest reason FFP is given and the commonest reason it should not be.
- Irradiated Blood Component Indication InterpreterWork out whether this patient needs irradiated cellular components, using the indication list from the 2020 British Society for Haematology guideline. Transfusion-associated graft-versus-host disease is almost always fatal and entirely preventable — and leucodepletion does not prevent it.
- Kleihauer–Betke Fetal Bleed CalculatorConvert a Kleihauer acid-elution percentage into the volume of a fetomaternal haemorrhage — reported as fetal whole blood, with the fetal red cell figure that anti-D dosing actually needs.
- Massive Haemorrhage Product Ratio CalculatorHow many units of plasma and of platelets accompany a given number of red cell units at 1:1:1 or 1:1:2 — with the PROPPR notation spelt out, because the ratio is written plasma first and the 2 is red cells.
- Maximum Allowable Blood Loss CalculatorEstimate the volume of blood that can be lost before a chosen haemoglobin floor is reached, from weight and a patient-category blood volume. This is a planning figure for a theatre list, not a transfusion trigger — the decision to transfuse rests on the patient, not on this arithmetic.
- Neonatal Exchange Transfusion Volume CalculatorCalculate the volume for a double-volume exchange transfusion in a term or preterm baby, and see what the procedure actually achieves — and costs.
- Platelet Refractoriness InterpreterA poor platelet increment is usually consumption, not antibody. Enter the corrected count increment at one hour and at 20–24 hours with the clinical context, and see whether this is immune refractoriness or something being done to the platelets after they arrive — because the timing is what separates them.
- Prothrombin Complex Concentrate (PCC) Dose CalculatorDose a four-factor prothrombin complex concentrate for warfarin reversal from weight and the presenting INR — and give 5 mg of intravenous vitamin K with it, every time, because the concentrate lasts hours and the warfarin lasts days.
- Red Cell Transfusion Volume CalculatorCalculate the packed red cell volume needed to raise haemoglobin to a target, and the rate limits that keep it safe.
- TACO vs TRALI InterpreterBoth present as hypoxia during or after a transfusion, and telling them apart changes the treatment completely. Work through the discriminators the 2019 TRALI consensus and the revised ISBT TACO definition actually use — timing, fluid balance, blood pressure, natriuretic peptide, diuresis and ARDS risk factors.
- Transfusion Reaction InterpreterStop the transfusion and check the identity of the unit against the patient first — that comes before any diagnosis. Then read the timing, the temperature change and the clinical features against the surveillance definitions for febrile, haemolytic, allergic, TACO, TRALI, bacterial and delayed reactions.