This chapter is at least loosely associated with Section F9(ii) from the 2017 CICM Primary Syllabus, which expects the exam candidates to be able to "interpret normal and abnormal blood gases". It would be presumptuous for any homebaked online resource to be able to claim that, from this low platform, one might be able to bestow upon the reader that sort of high-level ability. However, the syllabus document insists that some ABG interpretation should be a part of First Part preparation. This stands in the face of the fact that there are no ABG interpretation questions in the First Part written papers. Moreover, the interpretation of ABG data includes numerous non-respiratory things (acid base balance, haemoglobin, electrolytes, etc), making it difficult to categorise this chapter into any specific area of revision study.
So, in an effort to have one unified central point for blood gas interpretation, this chapter is offered as a directory and bibliography. Here is an ABG to be dissected (literally the first one the author came upon when he left his office to look for a picture of an ABG on the morning of writing this resource). The image is mapped so that a reader can click on the variables and be transported to a Deranged Physiology page which discusses the measurement and interpretation of that variable.
One might point out that this is a printout of a Radiometer ABL700 blood gas analyser, and therefore not representative of other blood gas analysers. Values presented here may have a different notation in other units, and even different Radiometer ABL700 installations may produce different variables depending on their users' selections. This resource, therefore, unfairly favours the trainees who are endemic in the authors' local environment.
Blood Gas Values
Acid Base Status
There are also a few ABG interpretation scenarios left over from an older version of this site, which may still be of some interest: