Location search | Quest Diagnostics
Medical Lab Testing • Belvidere, IL • Since 1967
Information from public sources; not independently verified. Confirm hours, insurance and appointment availability with the clinic.
Last gathered July 11, 2026. How our information is sourced · Report incorrect information
About
Quest Diagnostics Location search: Belvidere - Quest Diagnostics is a public medical and diagnostic laboratory company (NYSE: DGX), founded in 1967 and headquartered in Secaucus, NJ. - It operates globally with offices and labs in the United States and internationally (part of its ~42-country footprint). - For local Belvidere (IL) or Belvidere, NJ, locations specifically, Quest Diagnostics lists a central US presence and multiple offices in Secaucus, NJ, but no Belvidere-specific address is shown in the provided highlights. - If you need a Belvidere-specific Quest Diagnostics location (free-standing lab or patient service center), please provide the city/state (Belvidere, IL or Belvidere, NJ) or allow me to search for the nearest Quest Diagnostics patient service center in Belvidere. - Company: Quest Diagnostics - Industry: Medical and Diagnostic Laboratories - Headquarters: Secaucus, New Jersey, USA - Public since: 1996 (NYSE: DGX) - Global reach: 42 countries - Main contact: wellness@questdiagnostics.com; phone +1 866-697-8378 If you want, I can look up the exact Belvidere location and provide address, hours, and services.
Services Offered
Insurance & Payment
Not published.
Languages Spoken
Not published.
FAQs
What is OSF OnCall UC- Sycamore (Preferred) hours?
The page lists daily hours as shown in the extracted highlights; specific daily times include 8:00 am–6:00 pm for several days. If you need exact daily entries, please refer to the site as hours vary by location.
Social Media
Photos
Photos published by Location search | Quest Diagnostics showing the medical lab testing practice in Belvidere, IL.
What Patients Say
Overall sentiment across review platforms: negative
- Hours Guide (General aggregate for Belvidere): 4.2/5 (118 votes)
- ComplaintsBoard (Company-wide): 1.3/5 (7 reviews and 492 complaints)
Patients praise
- Some reports of professional, efficient, and kind staff members at specific locations
- Occasional instances of smooth, stress-free experiences
Common complaints
- Long wait times and difficulty scheduling appointments
- Frustrating automated/computer-based check-in systems lacking human interaction
- Difficulty reaching customer service or resolving issues with human representatives
- Billing confusion and unresolved errors
- Unprofessional behavior by some phlebotomists, including poor blood draw techniques
"They closed the receptionist window—there is no human contact at all anymore. Everything is pushed to a machine, and it’s simply not working."
- Trustpilot review of Quest Diagnostics"She stuck me then kept pulling needle almost out and gouging me. She finally just started rolling needle around in my arm until she got a vein."
- ConsumerAffairs review of Quest DiagnosticsSynthesized from public review platforms as of Jul 11, 2026 - sources: [1][2][3][4].
In the News
- 1000 Eleven S - Columbia, IL | Quest - Jun 16, 2026
- 237 E Center Dr - Alton, IL | Quest - May 20, 2026
- 111 N Wabash Ave - Chicago, IL | Quest - May 20, 2026
- Find a Quest Diagnostics in Unionville, | Quest - Jun 16, 2026
- Dr. Mary D. Simmons, MD - Family Medicine Doctor in Belvidere, IL - May 14, 2026
Information sourced from the clinic's website as of July 11, 2026.
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