---
kind: "section"
citation: "21 C.F.R. § 864.7735"
title: "21"
number: "864.7735"
heading: "Prothrombin-proconvertin test and thrombotest."
url: "https://uscodex.org/cfr/21/864.7735"
---

# §864.7735. Prothrombin-proconvertin test and thrombotest.

- (a) **Identification.** The prothrombin-proconvertin test and thrombotest are devices used in the regulation of coumarin therapy (administration of a coumarin anticoagulant such as sodium warfarin in the treatment of venous thrombosis and pulmonary embolism) and as a diagnostic test in conjunction with, or in place of, the Quick prothrombin time test to detect coagulation disorders.
- (b) **Classification.** Class II (special controls). The device is exempt from the premarket notification procedures in [subpart E of part 807](/cfr/21/part807-subpartE.md) of this chapter subject to the limitations in [§ 864.9](/cfr/21/864.9.md).

## Notes

### Amendments

[45 FR 60626, Sept. 12, 1980, as amended at 84 FR 71800, Dec. 30, 2019]

### Authority

Authority: 21 U.S.C. 351, 360, 360c, 360e, 360j, 360 l, 371.

### Amendments

[45 FR 60626, Sept. 12, 1980, as amended at 84 FR 71800, Dec. 30, 2019]