CFR›Title 21›Chapter I›Part 640›Subpart C ContainsSections 640.20–640.25CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart C—Platelets Sections 640.20 § 640.20 Platelets. 640.21 § 640.21 Eligibility of donors. 640.22 § 640.22 Collection of source material. 640.23 § 640.23 Testing the blood. 640.24 § 640.24 Processing. 640.25 § 640.25 General requirements. Previous B Subpart B—Red Blood Cells Next D Subpart D—Plasma