CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER H—MEDICAL DEVICES (parts 800 to 898) > PART 862—CLINICAL CHEMISTRY AND CLINICAL TOXICOLOGY DEVICES > SUBPART B—Clinical Chemistry Test Systems (§862.1020 to §862.1825) > 862.1700—Total thyroxine test system.

862.1700—Total thyroxine test system.

(a) Identification. A total thyroxine test system is a device intended to measure total (free and protein bound) thyroxine (thyroid hormone) in serum and plasma. Measurements obtained by this device are used in the diagnosis and treatment of thyroid diseases.
(b) Classification. Class II.