Unfortunately that isn't always immediately possible for everyone. There can be many reasons for that. The most common excuses are lack of money, lack of availability of medical support or simply fear of hearing bad news.
Fasting: 4 to 5.5 mmol/l (Australia, Canada, UK or other
millimole countries) or 70 to 99 mg/dl (USA and other milligrams
Post-meal: 4 to 8mmol/l or 70 to 140mg/dl.
Everything in Moderation - Except Laughter