{"data":{"id":"us/21-cfr-868.1750","jurisdiction":"us","citation":"21 CFR 868.1750","heading":"Pressure plethysmograph.","body":"(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.\n(b) Classification. Class II (performance standards).","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER H—MEDICAL DEVICES","PART 868—ANESTHESIOLOGY DEVICES","Subpart B—Diagnostic Devices"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"71d72498d70534e61462282c1c0a2e0daa14efc2f09a226d83cf324f780ca032","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-868.1730","next":"us/21-cfr-868.1760"},"notice":"GroundRules: Original legal text. Not legal advice."}