Experiences with a new blood oxygen analyzer (BOA 802, Dräger-Bio Marine) are reported. In the range up to 100 mm Hg data about 6 mm Hg to high were found compared with the AVL Gas Check. In the range between 100-300 mm Hg there was an increasing difference between values measured with the BOA 802 and a conventional oxygen electrode, however this does not seem to be of clinical relevance.