SaO2na
SaO2na is a data label occasionally encountered in clinical databases and electronic health record exports to indicate that arterial oxygen saturation (SaO2) data are not available for a given observation. The term is not a recognized clinical metric; rather, it reflects data missingness or noncollection status in a dataset.
In practice, SaO2 denotes the fraction of hemoglobin saturated with oxygen in arterial blood, typically reported
When a dataset marks SaO2na, researchers often address missing data via imputation, exclusion, or sensitivity analyses.
In data dictionaries or interoperability standards, similar suffixes or codes may appear to flag missing vital