Expired Study
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Chicago, Illinois 60637


To determine, through pharmacokinetic parameters, the ideal dosing protocol for dalteparin (a low molecular weight heparin) and unfractionated heparin for women desiring pregnancy who have evidence of an acquired (specifically, antiphospholipid syndrome) or inherited thrombophilia.

Study summary:

This study's specific objectives include: 1. Evaluating pharmacokinetic (concentration-time) and pharmacodynamic (concentration- effect) parameters for dalteparin and UFH prior to pregnancy, during the 1st, 2nd and 3rd trimesters and postpartum, using revised dosing protocols based on previous study. 2. Determining therapeutic response to the heparins, i.e. live birth rate and lack of maternal or fetal complications, in relation to drug exposure, based on AUC. 3. Documenting maternal and fetal complications during pregnancy for dalteparin and UFH, using the revised dosing protocols.


Inclusion Criteria: - Two or more consecutive, otherwise unexplained miscarriages under 10 weeks of gestation, or, an otherwise unexplained intrauterine fetal demise of at least 10 weeks of gestation, and, - Persistently positive antiphospholipid antibodies, or, presence of Factor V Leiden, or, Prothrombin 20210A, or, antithrombin, protein S, or protein C deficiency, or, hyperhomocysteinemia associated with the methylenetetrahydrofolate reductase (MTHFR) polymorphism. Exclusion Criteria: - Inability or refusal to give written informed consent. - Inability or refusal to self-administer heparin throughout pregnancy. - Hemoglobin value below 9.5 g/dL - Heparin use is contraindicated. - Renal disease. - Documented history of thrombosis.



Primary Contact:

Principal Investigator
Mary D. Stephenson, MD, MSc
University of Chicago

Backup Contact:


Location Contact:

Chicago, Illinois 60637
United States

There is no listed contact information for this specific location.

Site Status: N/A

Data Source: ClinicalTrials.gov

Date Processed: March 16, 2018

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