To avoid altering ABG results, be sure to use proper technique when drawing a sample of arterial blood. Remember:

• A delay in getting the sample to the laboratory or drawing blood for ABG analysis within 15 to 20 minutes of a procedure, such as suctioning or administering a respiratory treatment, could alter results.
• Air bubbles in the syringe could affect the oxygen level.
• Venous blood in the syringe could alter carbon dioxide and oxygen levels and pH.