Final answer:
Seating the butterfly needle refers to securing it properly in the vein after insertion. This ensures it stays in place and allows for effective blood drawing.
Step-by-step explanation:
The phlebotomist must "seat" the butterfly needle after inserting it. Seating the needle refers to securing it properly in the vein, so that it stays in place and blood can be drawn effectively. This is done by carefully adjusting the position of the needle and ensuring it is fully inserted and stable in the vein.