Anarterial blood gas is drawn on a 13-year-old boy who presented to thehospital with symptoms of diabetic ketoacidosis. In a hurry, thephysician has the first year medical student urgently obtain anarterial blood sample for analysis. The partial pressure of oxygen(PO2) is found to be 28 mm Hg (normal >80 mm Hg) with an oxygensaturation (SaO2) of 70% (normal >94%). However,at the time of thearterial blood sampling, the patient was in no acute distress with anoxygen saturation of 99% while on room air. He has no past history oflung disease, and no wheeze or rhonchi is auscultated on examination.Which of the following best explains the patient's currentpresentation? ()

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An arterial blood gas is drawn on a 13-year-old boy who presented to the hospital with symptoms of diabetic ketoacidosis. In a hurry, the physician has the first year medical student urgently obtain an arterial blood sample for analysis. The partial pressure of oxygen (PO2) is found to be 28 mm Hg (normal >80 mm Hg) with an oxygen saturation (SaO2) of 70% (normal >94%). However,at the time of the arterial blood sampling, the patient was in no acute distress with an oxygen saturation of 99% while on room air. He has no past history of lung disease, and no wheeze or rhonchi is auscultated on examination. Which of the following best explains the patient's current presentation? ()

A．The sample was drawn lateral to the femoral artery
B．The patient has obstructive lung disease
C．The sample was contaminated with room air
D．The patient has restrictive lund disease
E．The sample was drawn medial to the femoral artery

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