The NADAL® COVID-19 IgG/IgM rapid test showed a sensitivity (IgM/IgG) of 100% (100%/100%), a specificity (IgM/ IgG) of 98.8% (97.6%/100%), a PPV of 76.9% (57.1%/100%), an NPV of 100% (100%/100%), and a diagnostic accuracy of 98.8% (97.7%/100%). Here, CD40LG is linked to COVID-19.