CFR›Title 21›Chapter I›Part 640›21 CFR Part 640 Subpart C Citation21 CFR Part 640 Subpart CContainsSections § 640.20–§ 640.25CorpusDaily eCFRDisplayed edition2026-08-04Last updated2026-08-04 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. Authority21 U.S.C. 321, 351, 352, 353, 355, 360, 371; 42 U.S.C. 216, 262, 263, 263a, 264.Source38 FR 32089, Nov. 20, 1973, unless otherwise noted.