I have this adult patient, in DNR and GCS 7/15 state, to be trans-out to regular room on MV from the ICU. The patient was endorsed to me intubated from ER with no ET size indicated but only the level 2 shifts prior to my shift. How can I identify the ET size if it was inserted already and the ER doctor, who intubated, is not present to seek for answer? I endorsed the said patient with an ASSUMED ET size for adult....I know it's wrong but I'm trying my best not to do it again. I'm still fresh from being an ICU nurse.