NHS Blood and Transplant hopes to test how effective antibodies in the "convalescent" plasma of recently recovered patients might be in treating those fighting the infection.
Plasma, a yellowish liquid, is the largest constituent part of your blood, making up more than half (about 55%) of its overall content.
The main role of plasma is to "take nutrients, hormones and proteins to parts of the body that need it." It is a "critical" part of treatment for many serious health issues, according to the University of Rochester Medical Center.
In order to give plasma for this trial, donors must have recovered from coronavirus at least 28 days ago, and meet a series of criteria including being between the ages of 17 and 66 and weighing between 110lbs and 348lbs. They must not have any existing or previous heart condition.