Response to “Lupus anticoagulant is frequent in patients with Covid‐19” (JTH‐2020‐00483)

We appreciate the opportunity to respond to the letter from Dr. Inès Harzallah et al. I have also performed antiphospholipid antibody assays including lupus anticoagulant (LAC), anticardiolipin, and anti–β2‐glycoprotein I in dozens of our patients; however, very few of them got positive results. We do not believe that antiphospholipid antibody exists universally in COVID‐19 patients. In addition, two of the three reported cases with...