TY - JOUR T1 - Different seasons with decreased performance of immunochemical faecal occult blood tests in colorectal cancer screening JF - Gut JO - Gut SP - 1303 LP - 1304 DO - 10.1136/gut.2010.223412 VL - 60 IS - 9 AU - Leo G M van Rossum AU - Martijn G H van Oijen Y1 - 2011/09/01 UR - http://gut.bmj.com/content/60/9/1303.2.abstract N2 - In their paper, Grazzini et al described seasonal influences on the performance of an immunochemical faecal occult blood test (iFOBT) in colorectal cancer screening and concluded that the performance is 17% lower in the hot summer months than in winter.1 We wondered if this would also be true for other countries.In a previous study in the Netherlands we described lower positivity rates due to prolonged intervals between faecal sampling at home and delivery to the laboratory with the same iFOBT as that used by Grazzini et al.2 We analysed our data for testing in accordance … ER -