If you are curious about whether you have already had COVID-19 and would like to find out whether you already have antibodies, it is worth knowing that if you give blood, then the American Red Cross automatically tests donor blood and will tell you if you have COVID-19 antibodies.

20% of American donating blood test positive for COVID-19 antibodies.

CDC estimates that 25% of adults test positive in a random sample.

https://www.cnn.com/2021/03/15/health/red-cross-blood-donations-covid-antibodies/index.html

Covid-19 antibodies present in about 1 in 5 blood donations from unvaccinated people, according to data from the American Red Cross

By John Bonifield and Deidre McPhillips, CNN

Updated 12:01 AM ET, Tue March 16, 2021

https://www.cnn.com/2021/03/15/health/red-cross-blood-donations-covid-antibodies/index.html

Do something good for others while you find out information about yourself.

I searched the American Red Cross website for any mention about COVID-19 and found none. The following is from the Washington Post article two days ago.

https://www.washingtonpost.com/lifestyle/2021/03/17/covid-vaccine-blood-donation/

“If I’ve had covid-19 or taken a coronavirus vaccine, can I still donate blood?

“Of course — but with stipulations.”

“Although certain blood donation centers may have their own rules, at the Red Cross, donors who have been diagnosed with covid-19, the disease the virus causes; tested positive for the virus; or experienced any recent symptoms can still donate blood, but they must wait at least 14 days. Because some centers require longer deferrals, check with local blood banks.”