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Hum. Reprod. Advance Access originally published online on January 26, 2006
Human Reproduction 2006 21(4):967-971; doi:10.1093/humrep/dei422
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© The Author 2006. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Gender-specific association of the factor V Leiden mutation with fertility and fecundity in a historic cohort. The Leiden 85-Plus Study

F.M. van Dunné1,4, A.J.M. de Craen2, B.T. Heijmans3, F.M. Helmerhorst1 and R.G.J. Westendorp2

1 Department of Obstetrics, Gynaecology and Reproductive Medicine, 2 Department of Gerontology and Geriatrics and 3 Molecular Epidemiology Section, Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, The Netherlands

4 To whom correspondence should be addressed at: Department of Obstetrics, Gynaecology and Reproductive Medicine, Leiden University Medical Center, Postbus 9600, 2300 RC Leiden, The Netherlands. E-mail: frederique{at}vandunne.tk

BACKGROUND: Factor V Leiden (FVL, Arg506Gln) mutation may facilitate embryo implantation and increase fertility and fecundity. This was studied in subjects who were of childbearing age in a time with minimal fertility control without modern contraceptive methods. METHODS: From 1986 to 1999, 1502 inhabitants of Leiden, The Netherlands, reaching the age of 85 years were enrolled in the Leiden 85-Plus Study. Of 1176 subjects the FVL status was analysed, in 365 male and 811 female subjects. RESULTS: The FVL carrier rate was 4.3%. Fertility was not affected by FVL status. In male subjects, fecundity (interval between marriage and birth of first child) was significantly increased in FVL carriers; 67% of male FVL carriers had a child within 371 days of marriage (therefore conceived within 3 months of marriage), compared with 19% of male non-carriers [relative risk (RR), 3.5; 95% confidence interval (CI), 2.1–5.7; P < 0.001]. Within 6 months of marriage, 75% of male FVL carriers had conceived a child compared with 34% male non-carriers (RR, 2.2; 95% CI, 1.5–3.2; P = 0.01). In female subjects, fecundity was not influenced by FVL status. CONCLUSION: Fecundity is increased in male FVL carriers; in female subjects, no such association was observed.

Key words: factor V Leiden/fecundity/fertility/pregnancy/time-to-pregnancy


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