21 C.F.R. § 868.1760Download PDFCurrent through September 30, 2024Section 868.1760 - Volume plethysmograph(a)Identification. A volume plethysmograph is an airtight box, in which a patient sits, that is used to determine the patient's lung volume changes.(b)Classification. Class II (performance standards). 21 C.F.R. § 868.1760