Table 1 Prevalence of antiphospholipid antibodies in serum from patients with COVID-19 (n = 172).

The manufacturer’s cutoff: aCL IgG, IgM, IgA = 20 IgG, IgM, IgA phospholipid units; aβ2GPI IgG, IgM, IgA = 20 standard IgG, IgM, IgA units; aPS/PT IgG, IgM = 30 IgG, IgM phosphatidylserine units; aPL antibody, antiphospholipid autoantibodies; aCL, anticardiolipin antibodies; aβ2GPI, anti–β2 glycoprotein I antibodies; aPS/PT, anti-phosphatidylserine/prothrombin antibodies.

aPL antibodyNumber of positive
(manufacturer’s cutoff)
%Number of positive
(titer ≥40 units)
%
aCL IgG84.721.2
aCL IgM3923137.6
aCL IgA63.510.58
2GPI IgG52.931.7
2GPI IgM95.274.1
2GPI IgA74.131.7
aPS/PT IgG42242112
aPS/PT IgM31182112
Any positive aPL89525230