secede
Phlebotomy, venipuncture
If you are referring to withdraw from the Union, the term is "secede".
Aspirate
The term "pull out" means to withdraw from something. For example, in the sport of tennis, a player can "pull out" of a tournament because of injury.
of Withdraw
secede
secede
Venotomy, venesection, phlebotomy or venipuncture is piercing of a vein to withdraw blood. Venous cut-down is incision of a vein in an emergency to insert a tube to give fluids or other medications.
Rescind
Withdraw
I think you are trying to describe a Lumbar Puncture, which is performed in the lower (lumbar) region of the spine.
Praecipe is a legal term for an order.