Retrospective Study
Copyright ©The Author(s) 2015.
World J Gastroenterol. Jul 7, 2015; 21(25): 7834-7841
Published online Jul 7, 2015. doi: 10.3748/wjg.v21.i25.7834
Table 1 Kudo’s colonoscopist level classification
Colonoscopist levelPresentation of correlative level
IMostly beginners, able to push forward the colonoscope body in the colon cavity; unable to use the method of the colon axis constriction to shorten the length of the colon
IIAble to push the colonoscope through the descending sigmoid flexure by α-loop or N-loop, and pull back the colonoscope to set free the loop when the colonoscope head reaches the transverse colon; then, use the method mentioned above
IIIAble to control the colonoscope passing through the descending sigmoid flexure by α-loop or N-loop, and pull back the colonoscope to set free the loop when it reaches the descending colon; then, use the above-mentioned method
IVAble to control the colonoscope and keep the colon axis constriction from rectosigmoid flexure, pushing the colonoscope passing through the descending sigmoid flexure without loop formation