All patients scheduled for surgery at Boston Children's Hospital ages 6 months to 30 years undergoing the following qualifying surgeries:

Genito-Urinary/Urology Department:

Circumcision, Orchidopexy, Hypospadias Repair, Hernia Repair, Cystoscopy, Pyeloplasty, and Ureteral Reimplants or Ureteral Stents.

Otolaryngology Department:

Tonsil and/or Adenoid Removal, Tympanostomy, Tympanoplasty, and Mastoidectomy.

Orthopaedics Department:

Hip and Knee Arthroscopies, Hardware Removal, and Tendon Lengthening.

Plastic Surgery Department: Alveolar Cleft Repair.

Boston Children's Hospital Post Anesthesia Care Unit Outcomes Study