Volume of blood product donations. (A) Cumulative units of whole blood (red dashed line, right y-axis) and plasma (blue solid line, left y-axis) tested by Qualtex from September 2019 to July 2021. (B) Volume of whole blood collected at each center. (C) Volume of plasma collected at the largest established centers. (D) Volume of plasma collected at new centers after March 2020. For panels B-D, each line represents a single collection center.