Prepare the back with antiseptic.
Place a sterile drape over the area.
Identify the landmarks.
Inject local anesthetic into the skin and deeper tissues.
Insert the large, introducer needle into the selected spine interspace.
Direct the spinal needle through the introducer and into the subarachnoid space.
Free flow of spinal fluid confirms proper placement.
Aspirate for blood, then inject the selected anesthetic.
Remove the needle, introducer, and drape sheet.
Have the patient lie down.