StacksVerified U.S. regulatory reference

21 CFR §868.1750

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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.
  2. (b)Classification. Class II (performance standards).