Study Regarding the Incidence of Anti-platelet Factor 4-antibodies in Patients Aged 18 to 60 Years With Spontaneous or Infection- or Vaccine-associated or Recurrent Venous and/or Arterial Thrombosis

"The anti-platelet factor 4 antibodies in the blood are determined using latex agglutination and the chemiluminescence method in the coagulation laboratory of the CCB MVZ laboratory. In addition, the platelet factor 4-induced platelet activation test (PIPA test) and the heparin-induced platelet activation test (HIPA test) as well as an ELISA-based platelet factor 4 IgG antibody test (Prof. Greinacher, Greifswald University Hospital) will be performed as part of the routine work up.~In addition a new assay for heparin-independent anti-PF4 antibody detection provided by the company Werfen using chemiluminescence will be performed."