How this calculator works
Canadian Blood Services describes 10 to 15 mL/kg as a usual frozen plasma volume for appropriate indications. This calculator converts a prescription within that range into volume; it does not decide whether plasma is indicated. Unit volume varies by component and supplier, so use the actual label. The whole-unit figure rounds up mathematically and may exceed the prescribed volume; the transfusion team must decide what is administered. Massive haemorrhage and paediatric protocols are outside this tool. The result is an estimate for information only and is not medical advice.
Formula
Total volume (mL) = weight (kg) x prescribed volume (mL/kg). Equivalent units = total volume / labelled unit volume. Whole units = ceiling(equivalent units).
Worked example
70 kg at 15 mL/kg gives 1050 mL, or 4.2 units of 250 mL. Five whole units contain 1250 mL. At 60 kg and 10 mL/kg, 600 mL equals three 200 mL units.
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Frequently asked questions
Does a raised INR alone mean plasma is needed?
No. The decision depends on bleeding, the procedure, the cause and other treatment options.
Should I always transfuse the rounded whole units?
No. That is a planning count, not an order. Confirm the actual volume and plan with the transfusion service.
Are all plasma units the same size?
No. Read the component label rather than assuming a universal volume.