Before revision: :141 It is performed by measuring the arterial blood gases of the patient while they breathe room air, then re-measuring the blood gases after the patient has breathed 100%DIF < oxygen for 10 minutes.
After revision: It is performed by measuring the arterial blood gases of the patient while they breathe room air, then re-measuring the blood gases after the patient has breathed 100%DIF < oxygen for 10 minutes.