Expired gas sampling method and expired gas collecting tube.

摘要

A gas collecting tube (1) is used for sampling expired gas for preventing adsorption or contamination of aimed gas components contained therein and for enabling measurement with excellent reproducibility. The expired gas collecting tube (1) comprises a heating type flexible tube which includes an elastic tube superior in heat-resistance and provided circumferentially or inside with a heating element (3) on which a heat insulating material (4) covers, or a heating type hard tube made of metal or thermosetting resin and provided circumferentially or inside with a heating element on which a heat insulating material covers, and the heating type flexible tube or the heating type hard tube being provided at utmost end with an adapter (8) for mounting an expired gas collecting mask or mouthpiece (9).