The frequency of measuring depends on the kind of therapy.
If you are type 2 diabetic on oral and/or insulin therapy or if you administer insulin twice a day during a Conventional Therapy you should consider with your physician and healthcare team all details regarding blood glucose testing.
If you perform Intensified Insulin Therapy or you wear an insulin pump the frequency of blood sugar testing should be minimum 6 times a day.
In special situations the blood sugar should be tested more frequently, e.g. when you suspect hyperglycemia or even ketoacidosis, illnesses with fever, nausea or diarrhoea, intake of new medication or strong interferences of the daily life (night shift, holidays abroad with time delay).