evaluation of prenatal and postnatal diagnostic criteria for twin anemiapolycythemia sequence objective the aim of this study is to analyze the relevance of the prenatal and postnatal diagnostic parameters of twin anemiapolycythemia sequence tapsmethods diagnostic data of all cases of taps followed in our institution between 2006 and 2013 were reviewed statistical analyses were conducted using bayesian methodsresults twenty cases of taps were included we found a relationship between the hemoglobin level and the middle cerebral artery peak systolic velocity coefficient 025 034 015 prcoef1148 the mean diameter or098 032 306 pror1489 or the total diameter or079 036 153 pror1263 of arteriovenous anastomoses and the severity of tapsconclusion middle cerebral artery peak systolic velocity is a reliable tool for estimating the hemoglobin level in cases of taps the correspondence between prenatal and postnatal diagnosis is imperfect further studies are required to evaluate opportunity of widening postnatal diagnostic criteria 2014 john wiley sons ltd