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Thromb Haemost 1996; 76(05): 689-691
DOI: 10.1055/s-0038-1650644
Original Article
Schattauer GmbH Stuttgart

Free Protein S Deficiency May Be Found in Patients with Antiphospholipid Antibodies who Do not Have Systemic Lupus Erythematosus

M A Crowther
The Departments of Medicine and Laboratory Medicine, McMaster University, Hamilton, Ontario, Canada
,
M Johnston
The Departments of Medicine and Laboratory Medicine, McMaster University, Hamilton, Ontario, Canada
,
J Weitz
The Departments of Medicine and Laboratory Medicine, McMaster University, Hamilton, Ontario, Canada
,
J S Ginsberg
The Departments of Medicine and Laboratory Medicine, McMaster University, Hamilton, Ontario, Canada
› Author Affiliations
Further Information

Publication History

Received 12 February 1996

Accepted after resubmission 28 June 1996

Publication Date:
11 July 2018 (online)

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Summary

In order to determine if there is a relationship between antiphospholipid antibodies and reduced free protein S levels, we evaluated 21 patients who had an antiphospholipid antibody but had neither a history of venous thromboembolism nor systemic lupus erythematosus (cases) and 55 matched controls, who did not have an antiphospholipid antibody, a history of thrombosis or systemic lupus erythematosus. Cases and controls had similar protein C and antithrombin levels. Six of 21 cases had reduced free protein S antigen levels, compared to 5 of 55 controls (x 2 = 5.823 p <0.025). In addition, the mean free protein S level was significantly lower in cases than in controls (0.30 ± 0.09 units vs 0.39 ± 0.13 units, p <0.01, two-tailed Student’s t-test). We conclude that antiphospholipid antibodies are associated with a significant decrease in free protein S levels, and that this acquired free protein S deficiency may contribute to the thrombotic diathesis seen in patients with antiphospholipid antibodies.

 

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