21 CFR § 640.23 - Testing the blood.

---
identifier: "/us/cfr/t21/s640.23"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 640.23 - Testing the blood."
title_number: 21
title_name: "Food and Drugs"
section_number: "640.23"
section_name: "Testing the blood."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "F"
subchapter_name: "BIOLOGICS"
part_number: "640"
part_name: "ADDITIONAL STANDARDS FOR HUMAN BLOOD AND BLOOD PRODUCTS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321, 351, 352, 353, 355, 360, 371; 42 U.S.C. 216, 262, 263, 263a, 264."
regulatory_source: "38 FR 32089, Nov. 20, 1973, unless otherwise noted."
cfr_part: "640"
---


# 640.23 Testing the blood.

(a) Blood from which plasma is separated for the preparation of Platelets shall be tested as prescribed in § 610.40 of this chapter and § 640.5 (b) and (c).

(b) The tests shall be performed on a sample of blood collected at the time of collecting the source blood, and such sample container shall be labeled with the donor's number before the container is filled.

[40 FR 4304, Jan. 29, 1975, as amended at 50 FR 4139, Jan. 29, 1985; 53 FR 117, Jan. 5, 1988; 64 FR 45372, Aug. 19, 1999; 66 FR 1836, Jan. 10, 2001; 66 FR 31165, June 11, 2001; 80 FR 29904, May 22, 2015]