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

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Authors
Geirsson, R T
Have, G
Issue Date
1993-07

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Citation
Acta Obstet Gynecol Scand. 1993, 72(5):344-6
Abstract
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.
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http://dx.doi.org/10.3109/00016349309021109
ae974a485f413a2113503eed53cd6c53
10.3109/00016349309021109
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English Journal Articles (Peer Reviewed)

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