Screening for Diabetes  Table 3—  Summary of major
recommendations  Recommendations Evidence grading* Evaluation
for type 2 diabetes should be performed within the health care
setting. Patients should be screened at 3-year intervals
beginning at age 45; testing should be considered at an earlier
age or be carried out more frequently if diabetes risk factors
are present. E Diabetes risk factors include a family history of
diabetes; overweight defined as BMI ≥25 kg/m2; habitual physical
inactivity; belonging to a high-risk ethnic or racial group;
previously identified IFG or IGT; hypertension; dyslipidemia;
history of GDM or delivery of a baby weighing >9 lbs; and
polycystic ovary syndrome. B The FPG is the recommended
screening test. The OGTT may be necessary for the diagnosis of
diabetes when the FPG is normal. The FPG is preferred for
screenings because it is faster and easier to perform, more
convenient, acceptable to patients, and less expensive. C
Diagnostic testing should be performed in any clinical sit