---
kind: "section"
citation: "21 C.F.R. § 868.1750"
title: "21"
number: "868.1750"
heading: "Pressure plethysmograph."
url: "https://uscodex.org/cfr/21/868.1750"
---

# §868.1750. Pressure plethysmograph.

- (a) **Identification.** A pressure plethysmograph is a device used to determine a patient's airway resistance and lung volumes by measuring pressure changes while the patient is in an airtight box.
- (b) **Classification.** Class II (performance standards).

## Notes

### Authority

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

### Source

Source: 47 FR 31142, July 16, 1982, unless otherwise noted.