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Estimate your risk of type 2 diabetes using age, BMI, waist circumference, blood pressure, and family history. Get an initial screening recommendation.
Comparison with nonpregnant adult thresholds listed by US NIDDK, not a diabetes type diagnosis; confirmation and assay/context limitations apply. Reference
Start the evaluation by entering at least one test value.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This page compares one or more glucose or HbA1c entries with reference thresholds used for nonpregnant adults in the United States. It is a threshold checker: it does not use age, body size, blood pressure, family history, or a risk-score formula. The glucose unit selector switches between mmol/L and mg/dL; HbA1c is always entered as a percentage.
The reference values shown are fasting plasma glucose: prediabetes 100–125 mg/dL (5.6–6.9 mmol/L), diabetes threshold 126 mg/dL (7.0 mmol/L) or higher; two-hour glucose after a 75 g oral glucose tolerance test (OGTT): 140–199 mg/dL (7.8–11.0 mmol/L), diabetes threshold 200 mg/dL (11.1 mmol/L) or higher; and HbA1c: 5.7–6.4% or 6.5% and higher, respectively. Random glucose has no prediabetes band here; 200 mg/dL (11.1 mmol/L) or higher is flagged only when typical symptoms are selected. These are comparison thresholds, not a personalized diagnosis. NIDDK’s threshold table and the ADA 2026 Standards of Care explain the clinical test context.
Each completed value is checked independently. A diabetes-threshold match takes priority over prediabetes-range matches; otherwise the page may show a prediabetes prompt, a review prompt for random glucose without selected symptoms, or that none of the entered values met the listed thresholds. A normal-looking entry cannot rule out diabetes.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select mmol/L or mg/dL to match your lab report. Do not change the unit selector without converting the glucose number. HbA1c remains a percent in either mode.
Enter fasting glucose, the two-hour result from a 75 g OGTT, HbA1c, or random glucose. Leave unmeasured tests blank. Ordinary glucose after a meal is not interchangeable with the two-hour OGTT result.
The yes/no choice affects only how a random glucose value at or above the displayed threshold is described. It does not change the fasting, OGTT, or HbA1c comparisons.
The result updates when values are entered. Review which specific entries triggered a threshold, then discuss the original lab report and testing conditions with a healthcare professional.
Use cases
See how the tool fits into real work and everyday tasks.
Enter the values from a recent report to see which listed threshold each one meets. Bring the report itself, including its date and test names, so a clinician can interpret it in context.
If fasting glucose and HbA1c produce different prompts, keep both results visible and ask whether repeat or additional testing is appropriate. The checker does not reconcile conflicting tests.
Q&A
Find concise answers to common questions and confusing cases.
No. The current form compares glucose and HbA1c entries with thresholds. It does not calculate future risk from age, BMI, waist size, blood pressure, or family history.
No. That field is for the two-hour plasma glucose measured during a formal 75 g oral glucose tolerance test. A routine post-meal reading is a different measurement.
The page flags the random-glucose threshold only when typical symptoms are selected. If symptoms are absent or uncertain, it displays a review prompt rather than treating that value alone as confirmation.
They measure different things and can disagree. A clinician may consider repeat testing, the laboratory method, and conditions that affect HbA1c when interpreting discordant results.
Notes
Review scope, result limitations, and important precautions before use.
This educational comparison is not a diagnosis, does not determine diabetes type, and does not assess an individual’s overall risk. Clinical interpretation depends on the test, sample, symptoms, and whether an abnormal result needs confirmation; a single entry or home meter reading cannot establish a diagnosis. These reference cutoffs are for nonpregnant adults and do not cover pregnancy-specific testing. HbA1c can be affected by some blood conditions and other factors. Do not use a result below a displayed threshold to rule out disease or delay care; seek professional advice about symptoms or abnormal laboratory findings.
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