ABG levels 68. Recovered in this case?

Dear team, I took my dad to multispeciality hospital for respiratory issue's, they admitted him to ICU on 4 day's back, reports shown his ABG levels PCO2 is 55 at the time of admission again second day it went 68, third day it reduced to 62 again 4th day it was 57,and he was active,  latter hospital official reported we will shift from MICU to normal ward but today morning consultation in counselling doctors said his ABG levels again 69, they are giving NIU, needs again two days observations as per the doctor... I'm confused about this activity in hospital, yesterday he was so active today his saturation level is low and ABG levels high again, normally how many day's will ABG will vary or health of patient cab be recovered in this case?