📚 fresh frozen plasma 劑量計算機

Fresh frozen plasma (FFP) is a blood product used to replace clotting factors in patients with bleeding or coagulopathy, including reversal of warfarin, disseminated intravascular coagulation, and massive transfusion. The standard dosing strategy is weight-based: most guidelines recommend 10-15 mL/kg of body weight. This calculator converts a patient's weight and a chosen dose-per-kilogram into a total plasma volume and an approximate number of units to request.

Enter the patient's weight in kilograms and the desired dose in mL/kg (commonly 10, 12, or 15). The tool returns the total FFP volume in millilitres, the typical 10-15 mL/kg range for that patient, and an approximate unit count assuming an average FFP unit volume of about 250 mL. Unit volumes vary by collection method and country, so always confirm the actual volume printed on each bag.

The core equation is simply

For example, a 70 kg patient dosed at 12 mL/kg needs 70 × 12 = 840 mL. Dividing by the average unit volume of 250 mL gives roughly 3.4 units, so you would order 3-4 units. The low and high range values (weight × 10 and weight × 15) help you bracket a reasonable target.

A patient weighs 80 kg and the clinician chooses 15 mL/kg. The dose is

The 10 mL/kg lower bound is 800 mL and the 15 mL/kg upper bound is also 1,200 mL. At 250 mL per unit, that is about 4.8 units, so order 5 units.