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Diagnostic methodologies for circulating anticoagulants

¹Haematology Department, Westmead Hospital, Australia.

Thrombosis and Haemostasis

|July 1, 1995

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Lupus anticoagulants (LA) are phospholipid-interfering antibodies that can cause diagnostic challenges in coagulation testing. Recent research indicates LA may be heterogeneous, targeting complexes beyond simple phospholipids.

Area of Science:

Clinical Coagulation
Immunology
Hematology

Background:

Circulating anticoagulants in coagulation testing can complicate diagnosis, particularly those associated with bleeding.
Acquired coagulation inhibitors, such as lupus anticoagulant (LA), are increasingly recognized as factors in recurrent fetal loss and thrombosis.
LA, unlike SLE-associated antibodies, occur in both males and females and are defined by phospholipid interference.

Purpose of the Study:

To clarify the diagnostic challenges posed by various circulating anticoagulants, focusing on lupus anticoagulants (LA).
To explore the heterogeneity of LA and their targets beyond simple phospholipids.
To review current diagnostic criteria and suggested improvements for LA screening tests.

Main Methods:

Related Experiment Videos

Review of current diagnostic criteria for lupus anticoagulants, including phospholipid-responsive screening tests, mixing studies, and phospholipid correction.

Analysis of recent findings regarding the targets of LA, including complexes with beta-2-glycoprotein 1 and prothrombin.

Discussion of suggested improvements to standard LA screening assays (APTT, KCT, DTTI, DRVVT).

Main Results:

Lupus anticoagulants (LA) are the most common acquired coagulation inhibitors not associated with bleeding.
LA are increasingly implicated in adverse pregnancy outcomes and thrombotic events.
Evidence suggests LA are heterogeneous, often targeting phospholipid-binding proteins like beta-2-glycoprotein 1 or prothrombin, rather than phospholipids alone.

Conclusions:

Diagnosis of coagulation inhibitors, including LA, remains challenging due to overlapping characteristics and interfering effects.
LA are defined by phospholipid interference but are heterogeneous, with targets often involving protein-phospholipid complexes.
Ongoing research and assay improvements are crucial for accurate LA detection and understanding their clinical significance.