Comparison of actual and ultrasound estimated second trimester gestational length in in-vitro fertilized pregnancies.
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.


CONCLUSIONS
The equation used allows prediction of term with sufficient accuracy for general use in our population.
Department of Obstetrics and Gynecology, National University Hospital, Reykjavik, Iceland.
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D000886:Anthropometry; D005260:Female; D005307:Fertilization in Vitro; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D012016:Reference Values; D016216:Ultrasonography, Prenatal