PaO2d

PaO2d is not a widely recognized term in standard respiratory physiology or clinical practice. In many sources, PaO2 denotes the arterial oxygen partial pressure, a direct measure of oxygen tension in arterial blood, typically obtained from an arterial blood gas analysis. The suffix “d” does not have a universally agreed meaning for this parameter, and PaO2d may appear in some device manuals, proprietary software, or research datasets as a context-specific or derived value. Because definitions can vary by source, PaO2d should be interpreted with reference to the originating documentation.

In general, arterial oxygen tension (PaO2) reflects how well oxygen is able to move from the lungs into the bloodstream. Normal PaO2 at rest in adults is about 75 to 100 mmHg at sea level, and values below this range indicate hypoxemia. PaO2 is traditionally measured directly via arterial blood gas analysis, though estimated values can be inferred from oxygen saturation (SaO2) using the oxygen dissociation curve in certain calculations.

If PaO2d appears in clinical data or research, its meaning should be clarified. It could represent a derived or device-specific PaO2, a dynamically measured value under particular conditions, or a notation used for a modeled estimate rather than a directly measured PaO2. Accurate interpretation depends on the exact definition provided by the source.

See also: PaO2, PaO2/FiO2 ratio, A-a gradient, arterial blood gas, oxygen saturation.