Physiological Dead Space

Physiological Dead Space ( Total Dead Space ) is the portion of a tidal volume that does not participate in gas exchange because it either remains in the conducting airways (Anatomic Dead Space) or does not get in contact with blood flowing through the pulmonary capillaries (Alveolar Dead Space).

Vd: Is the dead space volume in mL
Vt: Is the tidal volume in mL
PaCO2: Partial pressure of carbon dioxide in the arterial blood in mmHg
PeCO2: Partial pressure of carbon dioxide in the expired (exhaled) air in mmHg

Physiological Dead Space Calculation

Tidal Volume: Vt in mL

Partial Presure of Arterial Carbon Dioxide: PaCO2 in mmHg

Partial Pressure of Carbon Dioxide in the Expired Air: PECO2 in mmHg

Calculate / Reset

Physiologic Dead Space: Vd in mL


Tusman, Gerardo & Suarez-Sipmann, Fernando & Bohm, Stephan. (2012). Rationale of Dead Space Measurement by Volumetric Capnography. Anesthesia and analgesia. 114. 866-74. 10.1213/ANE.0b013e318247f6cc.