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Human Reproduction, Vol. 14, No. 1, 224-228, January 1999
© 1999 European Society of Human Reproduction and Embryology

Marked variation in antiphospholipid antibodies during pregnancy: relationships to pregnancy outcome

J. Topping1,5, S. Quenby2, R. Farquharson1, R. Malia3 and M. Greaves4

1 Liverpool Women's Hospital, Crown Street, Liverpool L8 7SS, 2 Department of Obstetrics and Gynaecology, University of Liverpool, Liverpool, UK, 3 Department of Haematology, University of Sheffield, Sheffield, UK and 4 Department of Medicine and Therapeutics, University of Aberdeen, Aberdeen, UK

Variations in blood concentrations of antiphospholipid antibodies (APA) were investigated through the course of pregnancy in women who had a history of recurrent pregnancy loss, and were related to changes in pregnancy outcome. Serial measurements of APA were made in 16 women with antiphospholipid syndrome (APS) and 16 with negative APA tests pre-pregnancy. There was considerable intraindividual variation in test results through pregnancy. There was a significantly higher ratio of dilute Russell's viper venom time and IgG ACA titre in the first trimester compared with results pre-pregnancy in women with APS. Furthermore, transiently positive APA results were noted in the control group during pregnancy and some women with antiphospholipid syndrome tested negative for APA in mid- and late pregnancy. We have demonstrated clinically important variations in the results of tests for APA during pregnancy in women with APS.

Key words: antibodies/antiphospholipid/pregnancy

5 To whom correspondence should be addressed at: Arrowe Park Hospital, Arrowe Park Road, Upton, Wirral L49 5PE, UK


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