![]() Air bubbles (cause a fall in pCO2 and an increase in pO2).Excessive delay to processing (allows continued metabolism by the erythrocytes and reduces pH and pO2 and increases pCO2). ![]() ![]() Sources of inaccuracy associated with sample collection: analysis is performed as soon as possible by a blood gas machine.Blood is drawn into the syringe, using a needle that enters a vessel or from an intravascular cannula (e.g.‘self filling’ plungers that move when arterial pulsation is detected or plungers that are retractable to a desired sample volume creating a chamber for blood to enter.safety covers for needles when they retract or a foam pad to inject the sharp into before removing the syringe.needles of different length and gauge built into the syringe or are needle-less.should be left at room temperature and analysed within 30 minutes (previously glass syringes were kept chilled on ice to prevent metabolism and allow delays in analysis).have a cap to prevent contact with gases in the air.usually plastic (previously glass and required heparin to be added).contain a small amount of lyophilised heparin (e.g.collection of a blood sample for accurate analysis by a blood gas machine.special syringes are used for blood gas analysis.
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