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Second‐Trimester Estimated Fetal Weight and Discordance in Twin Pregnancies
Author(s) -
Fox Nathan S.,
Saltzman Daniel H.,
Schwartz Rachel,
Roman Ashley S.,
Klauser Chad K.,
Rebarber Andrei
Publication year - 2011
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.2011.30.8.1095
Subject(s) - medicine , percentile , gestational age , obstetrics , fetus , birth weight , fetal weight , pregnancy , gestation , crown rump length , twin pregnancy , gynecology , first trimester , statistics , genetics , mathematics , biology
Objectives The purpose of this study was to estimate the association between second‐trimester estimated fetal weight and fetal growth restriction in twin pregnancies. Methods A historical cohort of 306 twin pregnancies from a single center was analyzed. Estimated fetal weight and discordance at 18 to 24 weeks were calculated. Patients with a fetus whose second‐trimester estimated fetal weight was below the 10th percentile were compared to patients with both fetuses at or above the 10th percentile. Also, patients with second‐trimester discordance of 15% or greater were compared to patients with discordance of less than 15%. Results Second‐trimester discordance was significantly smaller than birth weight discordance (mean discordance ± SD, 7.41% ± 6.06% versus 11.43% ± 9.6%, respectively; P < .001). Patients with second‐trimester discordance of 15% or greater were significantly more likely to deliver a twin with a birth weight below the 10th percentile for gestational age (67.7% versus 44.1%; P = .012) and below the 5th percentile for gestational age (41.9% versus 22.8%; P = .019). Patients with a second‐trimester estimated fetal weight below the 10th percentile were significantly more likely to deliver a twin with a birth weight below the 10th percentile for gestational age (65.5% versus 44.5%; P = .031) and below the 5th percentile for gestational age (55.2% versus 21.5%; P < .001). Conclusions In twin pregnancies, second‐trimester estimated fetal weight below the 10th percentile and discordance of 15% or greater are associated with fetal growth restriction.