U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
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All TitlesTitle 21Chapter IPart 864Subpart G - Subpart G—Manual Hematology Devices
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(a) Identification. An osmotic fragility test is a device used to determine the resistance of red blood cells to hemolysis (destruction) in varying concentrations of hypotonic saline solutions.
(b) Classification. Class I (general controls). This device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 864.9.
