title: [Study on accuracy of endoscopic polyp size measurement by disposable graduated biopsy forceps].
abstract: OBJECTIVE
  To study the accuracy of endoscopic polyp size measurement by disposable graduated biopsy forceps (DGBF).
  
  
  METHODS
  Accurate gradation of 1 mm was made in the wire of disposable graduated biopsy forceps, which was used to measure the size of tumors under endoscopy. Fifty-eight polyps from 43 patients underwent endoscopy in our department from May to June 2013 were enrolled. Size of polyp was measured and compared among DGBF, routine estimation and direct measurement after resection. The accuracy of polyp size measurement was investigated by four colonoscopists who had finished at least 2000 procedures of colonoscopy.
  
  
  RESULTS
  The mean diameter of post-polypectomy measurement was (1.02±0.84) cm. Diameter was less than 1 cm in 36 polyps, 1 to 2 cm in 15, and over 2 cm in 7. The mean diameter of visual estimation was (1.29±1.07) cm, and the difference was significant as compared with actual size (P=0.000). The mean diameter measured by DGBF was (1.02±0.82) cm, and the difference was not significant as compared with actual size (P=0.775). The ratio of visual estimation to actual size was 1.29±0.31, and DGBF estimation to actual size was 1.02±0.11 with significant difference (P=0.000). The accurate rate of DGBF in estimating polyp size was 77.6% (45/58), which was obviously higher as compared to visual estimation [19.0% (11/58), P=0.000].
  
  
  CONCLUSIONS
  The accuracy of DGBF as a scale in the estimation of poly size increases as compared to visual estimation.
authors.affiliation: National center of colorectal surgery, The 3rd affiliated hospital of Nanjing University of Traditional Chinese Medicine, Jiangsu Integrate Colorectal Oncology Center, Nanjing 210001, China. jinheiying@hotmail.com.
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
authors.forename: Xiu
authors.initials: X
authors.lastname: Zhang
authors.forename: Hui-ping
authors.initials: HP
authors.lastname: Lin
authors.forename: Hei-jing
authors.initials: HJ
authors.lastname: Jin
authors.forename: Qiang
authors.initials: Q
authors.lastname: Leng
authors.forename: Jin-hao
authors.initials: JH
authors.lastname: Zhang
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Hang
authors.initials: H
authors.lastname: Yao
authors.forename: Kun-lan
authors.initials: KL
authors.lastname: Wu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy / Q000295:instrumentation*; D003113:Colonoscopy / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011127:Polyps / Q000473:pathology*; D011446:Prospective Studies; D013525:Surgical Instruments