With type 1 diabetes, doctors may recommend testing four to eight times a day, including before eating, before and after exercise, before going to bed and even during the night. Type 2 diabetics should test at least twice a day, depending on the insulin used, as stated by Mayo Clinic.
Every patient's testing schedule is set by his doctor according to his individual needs. Type 1 diabetics may need to check their levels even more frequently if they are sick, alter their routine or start new medicines. Type 2 diabetics who manage their condition with exercise and diet alone might not need to test each day, notes Mayo Clinic.