Give me a table show blood glucose levels in in fasting postprandial and random for normal prediabetic and diabetic all the ranges and HBA1c also
Reading File
Finding Sources
Searching PubMed
prediabetes diagnosis
Searching the Web
American Diabetes Association Standards of Care 2026 diagnosis fasting plasma glucose HbA1c random plasma glucose criteria
Blood glucose and HbA1c diagnostic ranges for nonpregnant adults
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| Fasting plasma glucose (FPG) after at least 8 hours without calories | <100 mg/dL (<5.6 mmol/L) | 100-125 mg/dL (5.6-6.9 mmol/L) | ≥126 mg/dL (≥7.0 mmol/L) |
| Postprandial glucose, 2 hours after a 75-g OGTT | <140 mg/dL (<7.8 mmol/L) | 140-199 mg/dL (7.8-11.0 mmol/L) | ≥200 mg/dL (≥11.1 mmol/L) |
| HbA1c | <5.7% (<39 mmol/mol) | 5.7%-6.4% (39-46 mmol/mol) | ≥6.5% (≥48 mmol/mol) |
| Random plasma glucose | No single diagnostic “normal” cutoff | No formal diagnostic range | ≥200 mg/dL (≥11.1 mmol/L) plus classic symptoms of high blood glucose or hyperglycemic crisis |
Important notes
- “Postprandial” diagnostic values refer specifically to a 2-hour plasma glucose during a formal 75-g oral glucose tolerance test (OGTT). A home glucose result 2 hours after an ordinary meal is useful for monitoring, but it is not by itself the standard test used to diagnose diabetes.
- A random glucose ≥200 mg/dL supports diagnosis only if there are classic symptoms such as frequent urination, excessive thirst, unexplained weight loss, or a hyperglycemic crisis.
- If there are no clear symptoms or crisis, an abnormal result generally needs confirmation on a separate day using the same or a different diagnostic test.
- HbA1c can be inaccurate in some situations, including significant anemia, recent blood loss or transfusion, hemoglobin variants, pregnancy, and advanced kidney disease.
These cutoffs align with the ADA 2026 diagnostic criteria. The textbook reference also lists prediabetes as HbA1c 5.7%-6.4%, fasting glucose 100-125 mg/dL, and 2-hour OGTT glucose 140-199 mg/dL: Henry's Clinical Diagnosis and Management by Laboratory Methods, Key Points.
This is a shared conversation. Sign in to Orris to start your own chat.