text: An<unk>  is a<unk>  test that is performed specifically on<unk><unk> , to determine the concentrations of carbon dioxide, oxygen and bicarbonate, as well as the pH of the<unk> . Its main use is in pulmonology, to determine<unk>  exchange levels in the<unk>  related to lung function, but it is also used in nephrology, and used to evaluate metabolic disorders such as acidosis and alkalosis. As its name implies, the sample is taken from an artery, which is more uncomfortable and difficult than venipuncture.
option_0: Arterial blood gas
option_1: Pulse oximetry
option_2: Fraction of inspired oxygen
option_3: Plethysmograph
option_4: Pulmonary gas pressures
option_5: Cardiotocograph
option_6: Cardiac electrophysiology
option_7: Central venous pressure