Fig. 2. Layout of areas used for the needle localization and excisional biopsy (NL/EB) process in the same-day surgery unit (SDSU) (third floor) and radiology (second floor) suites. The  arrows indicate patient flow. Patients enter the SDSU for registration at the check-in area, change into hospital garb, and are led into a holding area for a preoperative evaluation and intravenous catheter placement  (green arrow to SDSU^{Pre-Op & PACU}). When called for, patients are then transported to radiology for needle localization  (brown arrows ). They are then transported back up to a different holding area directly outside the operating rooms for further assessment and reconnection of the intravenous  (orange arrows to SDSU^{OR Holding}), before they enter the operating room (OR). PACU = postanesthesia care unit.