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DOI: 10.1055/s-0038-1661091
Correction of Clotting Factor “Deficiencies” in Plasma from Patients with Lupus-Like Anticoagulants
Publikationsverlauf
Received 30. Mai 1983
Accepted 09. Februar 1984
Publikationsdatum:
19. Juli 2018 (online)
Summary
Identification of spurious coagulation factor deficiencies that are known to occur in association with lupus-like anticoagulants (LLACs) requires the use of cumbersome laboratory procedures. To determine whether single-stage assays employing the APTT system may be used to identify such artifacts, we measured multiple clotting factor levels by several techniques in plasma of six patients with typical LLACs. While normal activities of factors VIII, IX, XI and XII were measured in only 4/24 APTT assays (17%) employing human plasma substrate, normal factor activities were present in all 24 APTT assays employing bovine, canine or rabbit plasma substrate. Normal factor II, V and X activities were recorded in all but one case in assays that utilized a modified Stypven time, while normal factor VIII levels were determined in 5/6 plasmas when the thromboplastin generation test was employed. These results indicate that the use of heterologous plasma substrates in the APTT system may provide a simple method to identify such coagulation factor “deficiencies”.
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