Is the birthweight of singletons born after IVF reduced by ovarian stimulation or by IVF laboratory procedures?

Is the birthweight of singletons born after IVF reduced by ovarian stimulation or by IVF laboratory procedures?

Abstract Singletons born after IVF are at risk of adverse pregnancy outcome, the cause of which is unknown. The present study investigated the influence of ovarian stimulation and IVF laboratory procedure on birthweight. Birthweight of singleton pregnancies resulting from IVF treatment with ( n = 16...

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Bibliographic Details
Published in:Reproductive biomedicine online Vol. 21; no. 2; pp. 245 - 251
Main Authors: Pelinck, M.J, Hadders-Algra, M, Haadsma, M.L, Nijhuis, W.L, Kiewiet, S.M, Hoek, A, Heineman, M.J, Middelburg, K.J
Format: Journal Article
Language:English
Published: Netherlands Elsevier Ltd 01-08-2010
Subjects:
Birth Weight
Female
Fertilization in Vitro
Humans
IVF
natural cycle
Obstetrics and Gynecology
ovarian stimulation
Ovulation Induction
perinatal outcome
Pregnancy
pregnancy outcome
single embryo transfer
IVF
single embryo transfer
pregnancy outcome
natural cycle
perinatal outcome
ovarian stimulation
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Summary:Abstract Singletons born after IVF are at risk of adverse pregnancy outcome, the cause of which is unknown. The present study investigated the influence of ovarian stimulation and IVF laboratory procedure on birthweight. Birthweight of singleton pregnancies resulting from IVF treatment with ( n = 161) and without ovarian stimulation (using a modified natural cycle (MNC) protocol; n = 158), and spontaneous conceptions in subfertile patients ( n = 132) were compared. Mean ± SD birthweight of singletons after conventional IVF with ovarian stimulation, MNC-IVF and natural conception were 3271 ± 655, 3472 ± 548 and 3527 ± 582 g ( P = 0.001). After adjustment for biological and social confounders, the difference in birthweight between conventional IVF and MNC-IVF was reduced to 88 g and the differences between conventional IVF and MNC-IVF versus spontaneous conceptions to 123 and 23 g, respectively. The results lead to three conclusions. First, a major part of the crude differences in birthweight between the three groups is related to patient and pregnancy characteristics. Second, the IVF laboratory procedure has no influence on birthweight. Third, although a trend towards lower birthweight after ovarian stimulation was found, an adverse effect of ovarian stimulation on birthweight was not substantiated.
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ISSN:1472-6483
1472-6491
DOI:10.1016/j.rbmo.2010.04.024