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Fetal hemoglobin changes in the twin oligohydramnios‐polyhydramnios sequence

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. Copyright © 1997 International Society of Ultrasound in Obstetrics and Gynecology