title: Fetal hemoglobin changes in the twin oligohydramnios-polyhydramnios sequence.
abstract: Fetal hemoglobin concentration was measured in each twin from five monochorionic pregnancies complicated by twin-to-twin transfusion, diagnosed by growth discordance and coexistent oligohydramnios-polyhydramnios. In three cases the hemoglobin concentration of the smaller twin with oligohydramnios was lower than the normal mean for gestation, and the hemoglobin difference was more than 5 g/dl in two of these cases. In the other two cases, the hemoglobin concentration of the four fetuses with coexistent oligohydramnios-polyhydramnios was within the normal range. This suggests that twin-to-twin transfusion may occur without hemoglobin changes, or that alternatively coexistent oligohydramnios-polyhydramnios occurs in the absence of twin-to-twin transfusion.
authors.affiliation: Fetal Medicine Unit, Guy's Hospital, London, UK.
authors.forename: S G
authors.initials: SG
authors.lastname: Carroll
authors.forename: A
authors.initials: A
authors.lastname: McLennan
authors.forename: D J
authors.initials: DJ
authors.lastname: Maxwell
mesh_terms: D005260:Female; D005312:Fetal Blood / Q000737:chemistry*; D005319:Fetal Hemoglobin / Q000032:analysis*; D005330:Fetofetal Transfusion / Q000097:blood* / Q000150:complications; D005865:Gestational Age; D006801:Humans; D016104:Oligohydramnios / Q000097:blood* / Q000150:complications / Q000000981:diagnostic imaging; D006831:Polyhydramnios / Q000097:blood* / Q000150:complications / Q000000981:diagnostic imaging; D011247:Pregnancy; D011248:Pregnancy Complications / Q000097:blood* / Q000000981:diagnostic imaging; D016216:Ultrasonography, Prenatal / Q000379:methods
chemical_list: D005319:Fetal Hemoglobin