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If the doctor needs more detailed information, the therapist may perform an arterial blood gas (ABG). She will draw blood from an artery, most likely from the inside of your wrist, for analysis with you sitting or lying down and resting. Sometimes, the doctor also asks for this arterial blood gas to be drawn while you exercise. This will be done with you lying down on a bed, pedaling an exercise bicycle that is at the end of the bed.