 
        Target antigens of autoantibodies, which can induce thrombotic diseases, and their interference in laboratory testing
| Autoantigen target | Clinical context | Possible cause and biological effect | Laboratory impact | 
|---|---|---|---|
| β2GP1 | Thrombosis, fetal loss | Interferes in coagulation cascade, Plt activation, targets immune system to blood cells | LA, positive ACA or APA assays | 
| PT | Thrombosis, fetal loss | Viral infection, interferes in coagulation cascade, targets immune system to blood cells | LA, decreased FII, apparent deficiencies in FVII, V, VIII, IX, X, XI, XII; positive anti-PT ELISA | 
| PS | Thrombosis, purpura fulminans | Varicella, inhibits PS anticoagulant activity | LA, decreased free PS, positive anti-PS ELISA | 
| PC | Severe thrombosis | Very rare, activated PC resistance | LA, decreased PC activity, positive anti-PC ELISA | 
| Annexin V, PZ | Thrombosis, abortions | Rheumatoid arthritis, systemic sclerosis, fetal loss, microangiopathy | LA, positive anti-A5 ELISA, flow cytometry | 
| TM | Thrombosis | Maligancy, inhibition of PC activation | Inhibits PC activation, positive anti-TM ELISA | 
| PF4 | Severe thrombocytopenia, thrombosis | Adenovirus vector vaccine, targets immune system to Plts and endothelial cells | Positive PAT and PF4 ELISA | 
| HPF4 complexes | Thrombocytopenia, thrombosis | Targets immune system to Plts and endothelial cells | Positive PAT and HPF4 ELISA | 
| ADAMTS-13 | TTP | Inhibits ADAMTS-13, high MW vWF multimers | Plt hyper-aggregability | 
| IL-8 | Peripheral thrombosis, DIC | Targets immune system to Plts and blood cells | Variable positive PAT and positive IL-8 ELISA | 
| Thrombin | Thrombosis, DIC | Inhibition of PC pathway | Prolonged clotting tests, positive AT ELISA | 
| GP1b-IX quinine | Immune thrombocytopenic purpura, Plt activation | Thrombocytopenia, thrombosis | Plt count, Plt activation, flow cytometry | 
| Alloantibodies to PLA | Thrombocytopenia, Plt activation, neonatal complications | Transfusion, allo-immunization | Plt activation, flow cytometry | 
A5: annexin 5; ACA: anti-cardiolipin-antibodies; ADAMTS-13: A disintegrin and metalloprotease with thrombospondin type I repeats-13; APA: anti-phospholipid antibody; MW: molecular weight; PAT: Plt aggregometry test; PLA: Plt alloantigen; TM: thrombomodulin; TTP: thrombotic thrombocytopenic purpura
JA: Conceptualization, Writing—original draft, Writing—review & editing.
JA is consultant for HYPHEN BioMed SAS.
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© The Author(s) 2024.