In-Depth: Why hospitals abandoned convalescent plasma for COVID-19 patients In-depth: Why hospitals stopped using plasma and last updated 2021-04-30 00:48:05-04 SAN DIEGO (KGTV) -- For months, U.S. hospitals relied on convalescent plasma to treat severely ill COVID-19 patients, administering as many as 25,000 units per week. But today, hospitals across the country have largely abandoned the once-touted therapy. The news may come as a surprise to the hundreds of thousands of Americans who got the treatment, particularly those who credited the experimental therapy with saving their lives. âÂ...