Most people who have had a blood glucose level over 500mg are considered to be into uncontrolled diabetis. When blood glucose level gets over 500mg, generally, the cause is uncontrolled diabetes. The effects of having a consistent high blood glucose level over 500mg can be devastating on the body which can cause complications such as heart disease and stroke, blindness, hypertension, diabetic neuropathy, nerve damage, depression, complications with feet, kidney disease and limb amputation. So watch out. Get sugars checked again and get dose adjustments for your medications.