What Is High Blood Serum? & High Glucose My Sugar

What is high blood serum? & high glucose my sugar levels @the hospital were between 489-590 all day they took a lot tests but I refused medical attention I became very upset & confused & left hospital with pic-line police were called to go back in HOSP. I was taken back to removed I-V I went home but not feeling well. My husband is wonderful to me ,& always takes care of me 25 yrs married he just gets worries .