What is the progression of O2 therapy for a patient?

I know this is a broad based question, based on a whole myriad of variables, but using general principles withing the nursing scope of practice is this the correct progression...

(1) Note what the order states to keep patient O2 sat at
(2) Patient put on O2 vial NC for decreasing O2 sat
(3) O2 via NC increased from 2L to 3L (assume this is not a COPD patient)
(3) O2 via NC increased to 4L (put on humidified O2)
(4) Patient is not taking deep breaths or breathing through nose---->get venti mask at lowest setting...page RT
Patient is a nose breather---->get face mask or non-rebreather mask...page RT

Of course if this scenario worsens, I as a staff RN would get RT/pulmonologist/doctor involved....but do the 4 steps listed above cover ME