CFR›Title 21›Chapter I›Part 864›Subpart B›21 CFR 864.1890 Citation21 CFR 864.1890CorpusDaily eCFRDisplayed edition2026-08-31Last updated2026-08-31 § 864.1890 xxxLink to an amendment published at 91 FR 53190, Aug. 17, 2026. Previous 864.1880 § 864.1880 Fluorescence in situ hybridization (FISH)-based detection of chromosomal abnormalities from patients with hematologic malignancies.