A method and apparatus for measuring CO.sub.2, O.sub.2 and chlorides in body fluids, such as whole blood, blood serum and plasma, etc. A reagent and a known amount of sample to be tested react in a closed vessel to release the gas to be measured into a gas space. A displacement liquid is then introduced...http://www.google.ca/patents/US3964864?utm_source=gb-gplus-sharePatent US3964864 - Method and apparatus for measuring CO.sub.2, O.sub.2, and Cl in body fluids
