For interpretation of the pO₂, the FiO₂ (% inspired O₂) should be stated on the request form if the patient is on O₂.

Samples must be transported to the laboratory within 30 minutes of collection for analysis.

2 - 5 mL arterial blood in heparinised syringe, anaerobically collected, i.e. no air space should be left in the syringe after collection.  Transport immediately on crushed ice to the laboratory, unless the sample can be analysed within 15 minutes.  If samples are left at room temperature, the pH and pO₂ fall and the pCO₂ rises due to cellular metabolism.

This sample is not to be sent via a Pneumatic Tube System.

Add ons for this test cannot be performed.