CD40LG and COVID-19: The LAC test is positive in 5–90% of patients infected with COVID-19, while a positive test for IgM anticardiolipin is present in 3–23%; additionally, a positive test for IgG is present in 5–13% of COVID-19 patients who fall in critical condition, while IgM aβ2GPI is present in 2–16% and IgG in 3–18% of patients.