Oral Glucose Tolerance Test (OGTT) Calculator
Interpret fasting and 2-hour glucose values from an OGTT to diagnose normal glucose tolerance, prediabetes, or diabetes.
How to Use
- Enter fasting glucose in mg/dL.
- Enter 2-hour post-load glucose in mg/dL.
- Click Calculate to see the diagnosis.
Use Cases
- •Diabetes screening and diagnosis.
- •Gestational diabetes evaluation.
- •Prediabetes identification.
Formula
ADA criteria: Normal = fasting <100 mg/dL AND 2h <140. Prediabetes = fasting 100–125 OR 2h 140–199. Diabetes = fasting ≥126 OR 2h ≥200.
Frequently Asked Questions
What is the OGTT?
The oral glucose tolerance test measures blood glucose fasting and 2 hours after a 75g glucose load to diagnose diabetes and prediabetes.
What fasting glucose confirms diabetes?
A fasting plasma glucose ≥126 mg/dL on two separate occasions confirms diabetes. A 2-hour value ≥200 mg/dL also confirms diabetes.
Disclaimer
For educational purposes only. Does not replace professional medical evaluation.