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Objectives: Investigation of the occurrence of postoperative hemorrhage after tonsillectomy and risk factors for these complications.

Study Design: Prospective National Audit with electronic web‐based data collection from the National Health Service and independent hospitals in England and Northern Ireland.

Methods: Consenting patients undergoing tonsillectomy between July 2003 and September 2004 were included. A central database of patient and surgical variables was developed for analysis of primary and secondary postoperative hemorrhage and development of risk models for tonsillectomy complications.

Results: The Audit received data from 277 hospitals in England and Northern Ireland on 40,514 patients. Analysis was conducted on 33,921 (84%) who gave consent. Over the whole Audit 1,197 (3.5%) postoperative hemorrhages were recorded. One hundred eighty‐eight (0.6%) patients sustained a …