Health experts have identified that plasma received from someone who has survived COVID-19 can be extremely beneficial to others who may contract the virus. Convalescent plasma is the liquid part of blood that is collected from patients who have recovered from COVID-19, according to the FDA. By taking your weight, they will know how much plasma you are eligible to donate. Donating without COVID-19 diagnosisPerhaps you haven’t been diagnosed with COVID-19, but you still want to help donate blood or plasma. Click here to learn more about plasma donation.