RT Journal Article SR Electronic T1 Polyethylene glycol 4000 as a continuously administered non-absorbable faecal marker for metabolic balance studies in human subjects JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 654 OP 660 DO 10.1136/gut.12.8.654 VO 12 IS 8 A1 Wilkinson, R. YR 1971 UL http://gut.bmj.com/content/12/8/654.abstract AB The use of polyethylene glycol 4000 as a non-absorbable, continuously fed faecal marker is described. The intestinal handling and transit of polyethylene glycol is compared with that of chromium sesquioxide and barium sulphate. Polyethylene glycol is an acceptable non-absorbable faecal marker for calcium, phosphorus, and fatty acids, and has several features which commend its use in preference to insoluble chromium sesquioxide and barium sulphate particularly when marking water-soluble dietary constituents.