لخّصلي

For practical reasons, initial testing is usually done shortly after a clinical event, followed by confirmatory testing at least 12 weeks later.5 Some nuances should be discussed though.At the time of an acute thromboembolic event, acute phase reactants such as C reactive protein, factor VIII, and fibrinogen might be markedly increased, altering coagulation test results (either increasing or decreasing times) and making it particularly important that lupus anticoagulant testing is repeated once the patient is stable.In addition, acute events have long been known to trigger the appearance of transient anticardiolipin antibodies,75 especially of low titer.

For practical reasons, initial testing is usually done shortly after a clinical event, followed by confirmatory testing at least 12 weeks later.5 Some nuances should be discussed though. At the time of an acute thromboembolic event, acute phase reactants such as C reactive protein, factor VIII, and fibrinogen might be markedly increased, altering coagulation test results (either increasing or decreasing times) and making it particularly important that lupus anticoagulant testing is repeated once the patient is stable. In addition, acute events have long been known to trigger the appearance of transient anticardiolipin antibodies,75 especially of low titer. Because of reports that antiphospholipid antibodies levels can fluctuate during pregnancy, either decreasing or increasing,767778 current International Society on Thrombosis and Haemostasis guidelines recommend that antiphospholipid antibodies results obtained during pregnancy be interpreted with caution.60 Results of a prospective observational study of 152 pregnant patients positive for antiphospholipid antibodies enrolled in the late first or early second trimesters found that 25% of lupus anticoagulant positive patients became negative in the second or third trimesters.79 IgG antiphospholipid antibodies levels were also significantly lower during the second and third trimesters, but among patients testing positive, IgG anticardiolipin antibodies and aβ2GPI results remained in the positive range through pregnancy in 93% and 85% of patients, respectively.79 Guidelines recommend that confirmation or exclusion of antiphospholipid antibodies positivity be confirmed after the postpartum period.60 Although the optimal timing of such testing is not established, one study found that lupus anticoagulant test results returned to baseline status three months after delivery.79