Diabetes Testing: A1c, Glucose, and Screening Explained (2026)
Diabetes and prediabetes affect tens of millions of Americans, and routine blood testing is the only reliable way to detect them early. Online lab portals give direct access to the most important diabetes screening tests — HbA1c, fasting glucose, fasting insulin, and bundled panels — at prices that are often a fraction of what uninsured individuals pay at clinical settings. This hub explains what each test measures and where to find the best prices.
Key takeaways
- For HbA1c alone: LabReqs is now cheapest at $28, beating HealthLabs and Walk-In Lab (both $29).
- For a diabetes panel (A1c + glucose together): LabReqs at $42.99 is the cheapest available — it covers both markers in one test, now at an even wider margin over DirectLabs ($59).
- For fasting glucose alone: Jason Health ($23) is cheapest; LabReqs ($27) is second.
- For fasting insulin: LabReqs, HealthLabs, and Walk-In Lab are all tied at $29 — LabReqs now ties for cheapest.
What each test measures
Hemoglobin A1c (HbA1c)
HbA1c measures the percentage of hemoglobin that has glucose attached to it, reflecting your average blood sugar level over the past 2–3 months. It does not require fasting, making it convenient for routine screening. Normal results: below 5.7%. Prediabetes: 5.7–6.4%. Diabetes: 6.5% or higher (on two separate occasions for diagnosis).
Fasting glucose
A fasting glucose test measures your blood sugar level after 8–12 hours without eating. It captures your blood sugar at a single point in time, unlike the A1c's long-term average. Normal fasting glucose: below 100 mg/dL. Prediabetes: 100–125 mg/dL. Diabetes: 126 mg/dL or higher. Fasting is required for accurate results.
Fasting insulin
Insulin testing measures the hormone responsible for moving glucose from the bloodstream into cells. Elevated fasting insulin — even with normal glucose — can indicate insulin resistance, an early metabolic change that precedes type 2 diabetes by years. It is often ordered by clinicians interested in early metabolic risk assessment. Fasting is required.
Diabetes panels
Bundled panels combine two or more markers. The most commonly compared are A1c + glucose combinations — ordering them as a bundle is often cheaper than ordering separately. More comprehensive panels add a CBC, comprehensive metabolic panel, or urine markers, but these additions make direct price comparison inappropriate.
Price summary
| Test | Cheapest | Price | Notes |
|---|---|---|---|
| HbA1c (standalone) | LabReqs | $28 | No fasting required; HealthLabs / Walk-In Lab also at $29 |
| Fasting glucose (standalone) | Jason Health | $23 (fee-inclusive) | Fasting required |
| Fasting insulin (standalone) | LabReqs / HealthLabs / Walk-In Lab | $29 | Fasting required |
| Diabetes panel (A1c + glucose) | LabReqs | $42.99 | Cheapest panel for both markers combined |
For full per-provider breakdowns and all fee disclosures, see the Diabetes Test Cost Comparison.
When to test and how often
Diabetes screening guidelines recommend testing for most adults, particularly those with risk factors such as overweight/obesity, family history, sedentary lifestyle, or prior gestational diabetes. General guidance:
- Screening for prediabetes/diabetes: For adults aged 35–70 who are overweight or obese, screening is recommended at least once. Those with risk factors may benefit from earlier or more frequent testing.
- Monitoring diagnosed diabetes: People with diabetes typically have HbA1c checked every 3–6 months. Glucose monitoring frequency depends on treatment type and glycemic control.
- Following a normal result: Retest every 3 years if the result was normal and no new risk factors have developed.
These are general guidelines. Your healthcare provider will recommend a testing schedule appropriate to your individual situation.
Diabetes testing pages
Diabetes Test Cost Comparison (2026)
Detailed prices for HbA1c, fasting glucose, insulin, and diabetes panels. LabReqs leads on standalone A1c ($28) and is cheapest on the panel ($42.99).
Compare prices →Lab Tests Without Insurance
How to order any lab test — including diabetes tests — without insurance, and what it costs.
Read the guide →Frequently asked questions
What A1c level indicates diabetes?
An HbA1c of 6.5% or higher on two separate tests is diagnostic for diabetes. A result of 5.7–6.4% indicates prediabetes. Below 5.7% is considered normal. These thresholds are established by the American Diabetes Association and used by clinicians for diagnosis — always interpret results in consultation with a healthcare provider.
What is the cheapest diabetes test online?
For a standalone HbA1c, LabReqs is now cheapest at $28. HealthLabs and Walk-In Lab are next at $29. For the combination of A1c and glucose in one order, LabReqs' Diabetes Panel at $42.99 is the least expensive option available as of June 2026. DirectLabs is next at $59 but includes a broader comprehensive metabolic panel (CMP).
Do I need to fast for an HbA1c test?
No. HbA1c does not require fasting — it reflects your average blood sugar over 2–3 months, not your current level. You can eat and drink normally before the test. Fasting glucose and fasting insulin tests do require an 8–12 hour fast before the blood draw.
What is insulin resistance?
Insulin resistance occurs when the body's cells don't respond properly to insulin, causing the pancreas to produce more to compensate. It is a precursor to type 2 diabetes and often detectable via elevated fasting insulin levels before glucose becomes abnormal. A fasting insulin test can identify insulin resistance early, often years before diabetes develops.
Sources
- MedlinePlus — A1C Test — https://medlineplus.gov/lab-tests/a1c-test/
- MedlinePlus — Blood Glucose Test — https://medlineplus.gov/lab-tests/blood-glucose-test/
- Provider pricing sourced from each provider's public website, May 2026.