Colorectal cancer patients undergoing surgery (6 studies, n= 1,714).
Systematic review to determine the prevalence and consequences of postoperative anaemia.
The prevalence of anaemia at discharge of 76.6% was reported as the primary endpoint in only one study. The rate of red blood cell transfusion and length of hospital stay were found to be significantly increased in anaemic patients, while postoperative infection rate results were variable. Quality of life scores and overall survival at 5 years were significantly affected among anaemic patients as reported in two papers.