Open AccessComparison of actual and ultrasound estimated second trimester gestational length in in‐vitro fertilized pregnancies
Author(s) -
Geirsson Reynir T.,
Have Grethe
Publication year - 1993
Publication title -
acta obstetricia et gynecologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 102
eISSN - 1600-0412
pISSN - 0001-6349
DOI - 10.3109/00016349309021109
Subject(s) - medicine , confidence interval , gestational age , obstetrics , in vitro fertilisation , gestation , gynecology , ultrasound , population , pregnancy , biology , radiology , genetics , environmental health
Objective . To compare actual and calculated gestational age in pregnancies conceived by in‐vitro fertilisation. Methods . In 36 healthy women conceiving by in‐vitro fertilisation an equation described for use in a Nordic population was used for calculating gestational age from the biparietal diameter and femur length at a routine 18–19 week scan. This was compared to actual gestational length estimated from the day between oocyte retrieval and embryo transfer. Results . The mean difference amounted to −0.86 days with a standard deviation of 2.86 days, a range of −5 to +6 days and a 95% confidence interval −0.11 to 1.83 (t=1.806, df = 35, p = 0.8). Correlation between the two methods was highly significant. Conclusion . The equation used allows prediction of term with sufficient accuracy for general use in our population.