Hi all, i was normal with normal blood sugar below 140, but i took Prednisone for one week with 30gm per day, suddenly my blood glucose level shot up above 200 showing values of 240 now i stopped Prednisone one week back but still showing the same value, how will it come down or shall i have to take diabetic medicines, and i am on diet,

Secondly, what is the reason for abnormal values shown by blood glucose testing mahcine once i tested shows 135mg/dl, very next moment means within 30sec when retested it was showing 239 which is one correct and why is this ? machine is brand new,