For the answer to the question above,
let's say Each unit of packed red blood cells contains 250 ml. Each unit is to infuse over 1 hour (60 minutes).
Use the following equation:
250 ml/60 minutes = 4.16 ml.
Multiply by the drip factor:
4.16 ml × 10 gtt = 41.6 gtt/minute (42 gtt/minute).