CFR - Code of Federal Regulations Title 21

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For the most up-to-date version of CFR Title 21, go to the Electronic Code of Federal Regulations (eCFR).

[Code of Federal Regulations]

[Title 21, Volume 8]

[CITE: 21CFR866.4540]

TITLE 21--FOOD AND DRUGS

CHAPTER I--FOOD AND DRUG ADMINISTRATION
DEPARTMENT OF HEALTH AND HUMAN SERVICES

SUBCHAPTER H - MEDICAL DEVICES

PART 866 -- IMMUNOLOGY AND MICROBIOLOGY DEVICES

Subpart E - Immunology Laboratory Equipment and Reagents

Sec. 866.4540 Immunonephelometer equipment.

(a) Identification. Immunonephelometer equipment for clinical use with its electrical power supply is a device that measures light scattering from antigen-antibody complexes. The concentration of these complexes may be measured by means of reflected light. A beam of light passed through a solution is scattered by the particles in suspension. The amount of light is detected by a photodetector, which converts light energy into electrical energy. The amount of electrical energy registers on a readout system such as a digital voltmeter or a recording chart. This electrical readout is called the light-scattering value and is used to measure the concentration of antigen-antibody complexes. This generic type of device includes devices with various kinds of light sources, such as laser equipment.

(b) Classification. Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 866.9.

[47 FR 50823, Nov. 9, 1982, as amended at 54 FR 25047, June 12, 1989; 66 FR 38792, July 25, 2001]