Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/54773
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Type: Journal article
Title: Inherited thrombophilias are not increased in "idiopathic" small-for-gestational-age pregnancies
Author: McCowan, L.
Craigie, S.
Taylor, R.
Ward, C.
McLintock, C.
North, R.
Citation: American Journal of Obstetrics and Gynecology, 2003; 188(4):981-985
Publisher: Mosby Inc
Issue Date: 2003
ISSN: 0002-9378
Statement of
Responsibility: 
Lesley M. E. McCowan, Susan Craigie, Rennae S. Taylor, Chris Ward, Claire McLintock and Robyn A North
Abstract: Objective: The purpose of this study was to determine (1) whether the inherited thrombophilias (the factor V Leiden and prothrombin gene mutations and the methylenetetrahydrofolate reductase [C677T] polymorphism) are increased in women with “idiopathic” (normotensive) small-for-gestational-age pregnancies and/or in their babies and (2) whether fetal carriage of a thrombophilia is associated with abnormal umbilical Doppler studies. Study Design: This was a case-controlled study of normotensive women who were delivered of a singleton small-for-gestational-age baby (birth weight, <10th percentile adjusted for sex) with no clinical evidence of chromosomal or congenital abnormality. Control subjects were healthy women who were delivered of appropriate-for-gestational-age babies. Results: One hundred forty-five women with small-for-gestational-age pregnancies and 290 control subjects were recruited. Small-for-gestational-age babies were born at an earlier gestational age (38 ± 3.0 weeks) and with a lower birth weight (2373 ± 521 g) than control babies (39.7 ± 1.3 weeks and 3606 ± 423 g, P < .01). There were no differences in the rates of factor V Leiden (2.8% vs 3.8%; relative risk, 0.79; 95% CI, 0.34-1.85), prothrombin gene mutation (2.8% vs 3.1%; relative risk, 0.92; 95% CI, 0.40-2.09), and methylenetetrahydrofolate reductase C677T polymorphism (13% vs 9%; relative risk, 1.27; 95% CI, 0.87-1.84) between mothers with small-for-gestational-age babies and control subjects, respectively. Inherited thrombophilias were not increased in small-for-gestational-age babies compared with control babies. Of small-for-gestational-age babies with abnormal umbilical artery Doppler studies (n = 25), 21% had a thrombophilia compared with 11% with normal umbilical artery Doppler studies (n = 68; relative risk, 1.75; 95% CI, 0.81-3.81). Conclusion: The rates of these inherited thrombophilias are not increased in normotensive women with small-for-gestational-age pregnancies. Further studies are required to determine whether thrombophilias are increased in small-for-gestational-age babies with abnormal umbilical Doppler study results.
RMID: 0020093556
DOI: 10.1067/mob.2003.218
Appears in Collections:Obstetrics and Gynaecology publications

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