A respirаtоry therаpist is perfоrming оxygen titrаtion with exercise for a patient with interstitial lung disease. At the beginning of the test, the patient is receiving oxygen through a nasal cannula at 3 L/min and has an SpO2 of 93%. Four minutes after exercise begins, the patient’s SpO2 is 86%. The patient has not complained of dyspnea. The therapist should (Remember an oxygen titration test is not the same as a 6 MWT)