Lab Testing in Illinois
Order lab tests in Illinois.
Order online, get physician authorization in minutes, and walk into any Quest Diagnostics or Labcorp location in Illinois — Chicago, Aurora, Rockfordand statewide — no appointment needed at most sites. Results post in 1–3 business days; tests start at $14.99 with HSA/FSA accepted and no insurance or doctor's visit required. Among Illinois orders September 2025 – September 2026, the most-ordered test was Comprehensive Metabolic Panel.
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Lab options in Illinois
Orders placed from Illinois can be processed through Quest Diagnostics (the default) or Labcorp, depending on the specific test and your preference. Both maintain extensive networks of patient service centers across the state — most TestWell customers find a location within a 15-minute drive.
For most common tests, both Quest and Labcorp offer equivalent quality. If you have a preference (existing relationship with one lab, or one is meaningfully closer), you can specify lab routing during checkout.
Chicago and its collar counties have some of the densest lab coverage in the country — the city proper, plus suburban hubs like Naperville, Aurora, and Joliet, put most residents within a short drive of several Quest and Labcorp centers, and downstate coverage continues through Rockford, Peoria, and Springfield. That density means same-day draws are the norm: many Illinois customers order in the morning and have their sample collected before lunch. Note that Illinois is fully self-pay through TestWell — no insurance network questions, which is often the point for the many Chicagoans on high-deductible plans.
Major cities served: Chicago, Aurora, Rockford, Joliet, Naperville, plus dozens of additional cities and towns. Use the lab finder to locate the closest patient service center to your ZIP code.
What do people in Illinois ask before ordering?
Can I walk into a lab in Chicago the same day I order?
Usually, yes. Physician review typically completes within minutes of checkout, your requisition arrives by email, and most Chicago-area Quest and Labcorp centers accept walk-ins. Morning orders are routinely drawn the same day.
Do Illinois lab orders require a referral from my doctor?
No. TestWell includes review and authorization by a physician licensed for Illinois with every order — that's what makes self-ordering legal and legitimate. Your results are standard Quest/Labcorp reports you can share with any provider afterward.
What lab tests do people in Illinois order most?
Across TestWell orders from Illinois between September 2025 – September 2026, the most-ordered items were Comprehensive Metabolic Panel ($22.99, in 15.9% of orders), Hemoglobin A1c ($21.99, 9.1%), TSH + Free T4 ($27.99, 9.1%). Draws happen at Quest Diagnostics or Labcorp patient service centers in Chicago, Aurora, Rockford and statewide.
What are the most-ordered lab tests in Illinois?
Based on TestWell orders placed from Illinois, September 2025 – September 2026. Same labs as your doctor, 50-80% below hospital self-pay rates. New to this? See how to buy labs online — no doctor's visit or insurance needed.
| # | Test or panel | Share of orders | Price |
|---|---|---|---|
| 1 | Comprehensive Metabolic Panel | 15.9% | $22.99 |
| 2 | Hemoglobin A1c | 9.1% | $21.99 |
| 3 | TSH + Free T4 | 9.1% | $27.99 |
| 4 | CBC (Complete Blood Count) | 6.8% | $21.99 |
| 5 | CBC with Differential | 6.8% | $21.99 |
| 6 | Tuberculosis (TB) Blood Test | 6.8% | $91.99 |
Share of orders containing the item, from TestWell's own order data; a panel counts once, not per component test. Updated September 5, 2026.
How TestWell works in Illinois
- 1
Order online — no doctor visit, no insurance, no referral
Browse 200+ individual tests and 50+ panels. Add to cart and check out with HSA, FSA, or any major credit card.
- 2
Get physician approval and your lab requisition (usually within minutes)
A licensed physician reviews and approves every order — included in the price, no separate fee. You receive a digital requisition via email immediately after approval.
- 3
Walk into any Quest Diagnostics or Labcorp location in Illinois
No appointment needed at most locations. Bring your ID and the digital requisition (printed or on your phone). Sample collection takes 5-15 minutes. Results land in your TestWell account in 1-5 business days depending on the test.
Ready to start?
Browse our full catalog or use the lab finder to locate the closest collection site in Illinois.