Diagnosis and Management of Prediabetes

Diagnostic Criteria and Laboratory Testing

The American Diabetes Association recommends verifying prediabetes with laboratory testing, including a fasting plasma glucose (FPG) test, and considering an A1C test and/or 2-hour plasma glucose during a 75-g oral glucose tolerance test (OGTT) 1
Diagnostic criteria for prediabetes include FPG: 100-125 mg/dL, 2-h PG during OGTT: 140-199 mg/dL, and A1C: 5.7-6.4% 1
The American Diabetes Association's Standards of Care state that laboratory confirmation is necessary before initiating any intervention or treatment plan 1

Home glucose meters have limitations, with FDA standards allowing 95% of readings to be within ±15% of the actual glucose value, which can lead to significant variations from laboratory values 2, 3
Meters are designed for monitoring, not diagnosis, due to their limitations 4

The American Diabetes Association recommends intensive lifestyle modification as the most effective strategy for managing prediabetes, including weight loss, physical activity, dietary changes, and self-monitoring [5 is ignored, as the fact is not from 'Praxis Medical Insights', but the original text does not provide another reference for this fact]
Metformin should be considered for individuals with specific risk factors, such as those under 60 years old with a BMI ≥35 kg/m² or those with FPG ≥110 mg/dL or A1C ≥6.0% [no reference available, as the original text ignores the reference]
Laboratory-based glucose testing should be performed every 6-12 months, with annual screening for diabetes complications and regular cardiovascular risk assessment 5

Discordant results should be addressed by repeating the test that was above the diagnostic threshold 1
Borderline results should be followed up with repeat testing in 3-6 months 5
Certain conditions, such as anemia or high hematocrit, can affect glucose meter accuracy, leading to false readings 2