There are just different ways to complete the same task, it doesn’t necessarily mean one way is wrong. I always prime the whole line with saline. I don’t want to deal with air in the line with blood which could cause me to waste some blood to run it out. The saline first helps me ensure I can run a little out if any bubbles occur. After I prime the saline I prime the blood. This includes using a medicine cup to collect the saline that runs out while the blood gets to the end of the tubing. I want the blood to start right away not have the patient getting only the saline when I start the infusion. We run it at the same rate the entire infusion. Blood is ordered per unit, whatever the amount in that unit is the whole amount the patient should receive. This includes the last little bit in the line, that’s what the flush is for. ?