---
title: Lab tests in Illinois
type: state
url: "https://www.test-well.com/lab-locations/illinois"
state: IL
default_lab: Quest
labs:
  - Quest
  - Labcorp
major_cities:
  - Chicago
  - Aurora
  - Rockford
  - Joliet
  - Naperville
order_data_scope: state
order_data_window: 2025-09-05 to 2026-09-05
---

# 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, Rockford and 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 item was Comprehensive Metabolic Panel.

## Lab options in Illinois

Orders placed from Illinois are drawn at **Quest Diagnostics** (the default) or **Labcorp**, chosen at checkout. Both run extensive networks of patient service centers across the state; results are clinically equivalent, so pick whichever is closer.

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.

## What do people in Illinois order most?

Share of TestWell orders from Illinois that included each item, September 2025 – September 2026.

| Item | Type | Price | Share of orders |
| --- | --- | --- | --- |
| [Comprehensive Metabolic Panel](https://www.test-well.com/tests/comprehensive-metabolic-panel) | Test | $22.99 | 15.9% |
| [Hemoglobin A1c](https://www.test-well.com/tests/hemoglobin-a1c) | Test | $21.99 | 9.1% |
| [TSH + Free T4](https://www.test-well.com/tests/tsh-with-free-t4) | Test | $27.99 | 9.1% |
| [CBC (Complete Blood Count)](https://www.test-well.com/tests/cbc) | Test | $21.99 | 6.8% |
| [CBC with Differential](https://www.test-well.com/tests/cbc-with-differential) | Test | $21.99 | 6.8% |
| [Tuberculosis (TB) Blood Test](https://www.test-well.com/tests/tuberculosis-blood-test) | Test | $91.99 | 6.8% |

## Illinois questions

### 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, 15.9% of orders), Hemoglobin A1c ($21.99, 9.1% of orders), TSH + Free T4 ($27.99, 9.1% of orders). Draws happen at Quest Diagnostics or Labcorp patient service centers in Chicago, Aurora, Rockford and statewide.

## How it works in Illinois

1. Choose tests or a panel at https://www.test-well.com/tests and check out (card, HSA or FSA).
2. A physician licensed for Illinois reviews and authorizes the order — included in the price, usually within minutes.
3. Walk into any Quest Diagnostics or Labcorp location in Illinois with the emailed requisition and a photo ID; most centers take walk-ins.
4. Results post to your secure TestWell portal in 1–3 business days with reference ranges and flags.

- [Find a draw site by ZIP](https://www.test-well.com/find-a-lab)
- [All states](https://www.test-well.com/lab-locations)
- [Browse tests](https://www.test-well.com/tests)

---

Canonical page: https://www.test-well.com/lab-locations/illinois
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.