Early detection of complications is extremely important because appropriate therapy can prevent progression.
Eyes: A dilated eye examination every year.
Feet: Check for lesions, vascular status and neurologic integrity at least annually if normal. For any abnormality, check at each visit.
Kidneys: Urinalysis for microalbuminuria every year.
Lipids: Fasting lipid profile every year if not yet on therapy.
For further details see American Diabetes Association: Clinical Practice Recommendations 2010.