Anyone who’s needed a blood test for a routine checkup or a doctor’s order knows the hassle of finding a reliable lab nearby. Quest Diagnostics operates one of the largest clinical laboratory networks in the United States, with about 2,200 patient service centers where you can get samples collected.

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Founded: 1967 as MetPath ·
Headquarters: Secaucus, New Jersey ·
Patient Service Centers: Approximately 2,200 ·
Employees: Over 47,000

Quick snapshot

1Confirmed facts
2What’s unclear
  • Exact total number of global locations varies by year
  • Whether all locations accept walk-ins depends on state and site
3Timeline signal
4What’s next
Key facts about Quest Diagnostics
Attribute Value
Founded 1967 as Metropolitan Pathological Laboratory (MetPath)
CEO Jim Davis (as of 2025)
Number of Patient Service Centers Approximately 2,200 across the U.S.
Employees Over 47,000
International Offices Ireland (Dublin), other select locations
Test Menu Thousands of tests including routine blood work, genetics, infectious disease, and wellness panels

The pattern: the company’s U.S. footprint dominates, while international operations remain a footnote.

How Many Locations Does Quest Diagnostics Have?

Quest Diagnostics describes itself as the world’s leading diagnostics information services company, with a network that covers most major U.S. metropolitan areas. Official location pages state that the company operates “approximately 2,000 patient locations” (Quest Diagnostics Pembroke Pines location page), while corporate data points to roughly 2,200 patient service centers. That is a network large enough that most Americans live within a short drive of a Quest center.

The upshot

For anyone searching “Quest Diagnostics near me,” the odds are strong that a location exists within 10–20 miles in any metro area. The company’s own search tool lets users enter a ZIP code and see nearby centers with hours and services.

Quest Diagnostics’ global footprint

The company’s international presence is small compared to its U.S. footprint. Aside from its U.S. locations, Quest has a laboratory in Dublin, Ireland, and a few other international outposts. The official location search tool primarily returns U.S. results, which means international travelers or expats may need to rely on local labs abroad.

International presence: Ireland and beyond

While the vast majority of Quest Diagnostics’ 2,200+ patient service centers are in the United States, the company does maintain a clinical testing laboratory in Santry, Dublin, Ireland (Unit 20, Northwood House). This location offers the same range of laboratory services. Other international sites are limited, and the company’s growth strategy remains U.S.-focused.

For patients outside the U.S., Quest’s reach is thin — the Dublin lab is the only major international testing hub.

Is Quest Diagnostics in Ireland?

Yes, Quest Diagnostics operates a clinical testing laboratory in Santry, Dublin, Ireland. The address is Unit 20, Northwood House, Santry, Dublin 9. This facility provides the same range of laboratory services available in the U.S., though the company’s international footprint remains small compared to its domestic network.

Ireland office details

The Dublin laboratory offers routine blood work, specialized testing, and other clinical services. Patients in Ireland can access Quest’s testing menu through physician referrals. The location serves as a key European hub for the company.

Other international locations

Beyond Ireland, Quest Diagnostics has limited international outposts. The company’s primary focus remains the U.S. market, where it operates approximately 2,200 patient service centers. International travelers should confirm availability before relying on Quest outside the United States.

What to watch

The official location search tool primarily returns U.S. results, so international patients should call ahead to verify services.

What Can Quest Diagnostics Test For?

Quest Diagnostics offers a broad menu of clinical laboratory tests including blood, urine, and other specimens. Representative location pages say the company provides “3,500+ lab tests” (Quest Diagnostics Oakland Park location page). Tests can be ordered by a physician or purchased directly by consumers through QuestDirect, the company’s self-order arm. This dual path makes Quest a one-stop shop for both doctor-ordered and proactive health screening.

Six facts, one pattern: routine wellness and chronic disease monitoring dominate the test volumes, while specialty tests (genetics, infectious disease) make up a smaller share.

Routine blood tests and health panels

The vast majority of tests ordered are for common panels such as complete blood count (CBC), basic metabolic panel, lipid panel, thyroid panel, and hemoglobin A1c. These are the tests that fuel annual physicals and chronic disease management. Turnaround times for these panels typically range from 24 to 72 hours, according to location page details (Quest Diagnostics Pembroke Pines location page).

Specialty testing: genetics, infectious disease, and more

Beyond basic panels, Quest Diagnostics offers specialized testing including genetic screening, sexually transmitted infection testing, food allergy panels, and even pharmacogenomics (how your genes affect drug response). These tests often require a doctor’s order or can be purchased via QuestConsumer Inc. without a prescription. The turnaround for specialty tests can stretch to one to several weeks depending on complexity.

Self-ordered tests via Quest Consumer Inc. (QuestDirect)

Through QuestDirect, consumers can purchase lab tests directly — no doctor visit, no prescription. Available tests include vitamin deficiency, thyroid function, heart health, and even a full wellness panel. Pricing is transparent online. Quest location pages note that “sample collection can be completed for both doctor-ordered and self-purchased lab work” (Quest Diagnostics Oakland Park location page).

The implication: Quest serves two distinct patient paths — physician-referred and direct-to-consumer — under one roof.

How Long Do Quest Results Take?

One of the most common questions from patients is when they can expect their lab results. The answer depends on the test type. According to Quest location pages, “most routine test results are available within 24–72 hours” (Quest Diagnostics Pembroke Pines location page). More complex tests take longer.

Typical turnaround times for common tests

For a basic metabolic panel or lipid panel, results are usually ready by the next business day. For thyroid panels or hemoglobin A1c, the same timeframe applies. Quest’s MyQuest online portal allows patients to view results as soon as they are finalized, with notifications sent via email or text.

Which blood tests take the longest?

Genetic sequencing tests, molecular assays for infections, and some autoimmune panels can take one to two weeks or more. These require more processing steps, often including culturing or multiple quality control checks. For patients scheduling such tests, it’s wise to ask the ordering physician for the expected turnaround.

What are red flags in a blood test?

Red flags are abnormal values that signal potential health issues. Common examples include high glucose (diabetes risk), low hemoglobin (anemia), elevated liver enzymes (liver stress), and high white blood cell count (infection). Quest does not interpret results — only a physician can. But being aware of which values are “red flags” helps patients have informed conversations.

What to watch

When using QuestDirect to self-order tests, patients receive the raw numeric results and a reference range, but no diagnostic comment. Any value outside the reference range should prompt a call to a clinician.

The pattern: routine results arrive quickly, but specialty tests demand patience — and red flags always require a doctor’s interpretation.

Is Quest the Same as Quest Diagnostics?

Yes and no. Quest Diagnostics is the parent company — the clinical laboratory giant founded in 1967. Quest Consumer Inc. is a subsidiary that sells lab tests directly to consumers without a doctor’s order, under the brand QuestDirect. The company’s history is rooted in its founding as Metropolitan Pathological Laboratory (MetPath) in 1967 (Quest Diagnostics Location Search).

Quest Diagnostics vs. Quest Consumer Inc.

Quest Diagnostics is the world’s leading diagnostic information services company, according to its own description. Quest Consumer Inc. is a separate legal entity that operates the direct-to-consumer test marketplace. While the same lab processes both doctor-ordered and self-ordered tests, the ordering path and payment differ.

Company history: MetPath and name changes

The company began in 1967 as Metropolitan Pathological Laboratory (MetPath), based in New York. It grew through acquisitions, changed its name to Corning Clinical Laboratories in the 1990s, and then rebranded as Quest Diagnostics in 1996. Today it is a Fortune 500 company with over 47,000 employees.

Relationship between the clinical lab and consumer arm

When a patient buys a test through QuestDirect, the sample is collected at the same Quest Diagnostics patient service center and processed in the same labs. The difference is that the test is self-ordered and self-paid, with results delivered directly to the consumer. The company recommends patients share results with their doctor anyway.

The catch: patients get the same lab processing but different payment and ordering paths — and still need a doctor to interpret results.

How to Schedule an Appointment (Step by Step)

Editor’s note

Quest Diagnostics states that “appointments take priority over walk-ins” at its patient service centers (Quest Diagnostics Oakland Park location page). Scheduling ahead is the smartest move.

  1. Find a location: Go to Quest Diagnostics Location Search official tool and enter your ZIP code. The site recommends using a ZIP code, not a city name, for best results (Quest Diagnostics Location Search).
  2. Select your location: Browse the list of nearby centers. Each entry shows address, phone, and hours. Some list Saturday availability (e.g., Pembroke Pines: Sat 6:30 am – 11:00 am; Quest Diagnostics Pembroke Pines location page).
  3. Schedule an appointment: Click the “Schedule an appointment” button on the location page. You can choose a date and time. If walk-ins are accepted, the page will note it. Appointments are strongly recommended.
  4. Bring required items: For doctor-ordered tests, bring the lab order form (if paper) or ensure your physician has sent it electronically. For self-purchased tests, bring the barcode or order confirmation from QuestDirect.
  5. Prepare for the test: Many tests require fasting (usually 8–12 hours). Check your test instructions on MyQuest or the order form. Drink water and wear comfortable clothing for blood draw.
  6. Check in and wait: Upon arrival, check in at the kiosk or front desk. Appointments are served before walk-ins. Wait times are typically 10–15 minutes for appointment holders.
  7. Sample collection complete: The phlebotomist draws blood or collects a urine sample. The process is quick. You’ll receive a receipt with a tracking number for the lab.
  8. Results online: Sign up for MyQuest to receive results as they become available. Most routine results are posted within 24–72 hours (Quest Diagnostics Pembroke Pines location page).
The implication: following these eight steps — from ZIP code search to MyQuest sign-up — turns a potentially frustrating errand into a predictable process.

Confirmed Facts vs. What’s Unclear

Confirmed facts

  • Quest Diagnostics has a laboratory in Santry, Dublin, Ireland (Unit 20, Northwood House)
  • Quest Consumer Inc. is a subsidiary that sells lab tests directly to consumers
  • The company was founded as MetPath in 1967
  • Most routine test results are available within 24–72 hours
  • Appointments take priority over walk-ins
  • In-home collection (Quest Mobile) may be available for purchase in some areas

What’s unclear

  • Exact total number of Quest Diagnostics locations worldwide (varies by year)
  • Whether all locations accept walk-ins (varies by state and site)
  • Specific turnaround times for every individual test (depends on test complexity and lab workload)
Additional sources

locations.questdiagnostics.com, locations.questdiagnostics.com, locations.questdiagnostics.com, locations.questdiagnostics.com

For those needing routine lab tests, finding a reliable blood work near me service can be just as important as locating a Quest Diagnostics center.

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Frequently asked questions

Can I walk in without an appointment at Quest Diagnostics?

Yes, many locations accept walk-ins, but appointments take priority. Check your location’s page for walk-in policy. The Oakland Park location page notes that appointments are scheduled first (Quest Diagnostics Oakland Park location page).

Do I need a doctor’s order to get lab tests at Quest Diagnostics?

Not if you use QuestDirect. You can purchase self-ordered tests online and visit a Quest location for sample collection. If you have a doctor’s order, bring it with you.

How do I prepare for a blood test at Quest Diagnostics?

Follow the specific instructions on your test order. Many common tests require fasting (no food or drink except water) for 8–12 hours. Stay hydrated and avoid strenuous exercise before the draw.

What should I bring to my Quest Diagnostics appointment?

Bring a government-issued photo ID, your insurance card (if using insurance), and any lab order form or barcode from QuestDirect. For self-purchased tests, bring the confirmation email.

Can I view my Quest Diagnostics results online?

Yes, through MyQuest portal. Register at questdiagnostics.com/myquest. Results are posted as soon as the lab releases them. Notifications are sent by email.

Is Quest Diagnostics open on weekends?

Many locations are open Saturday mornings. For example, the Pembroke Pines location is open Saturday 6:30 am to 11:00 am (Quest Diagnostics Pembroke Pines location page). Sunday hours are rare. Check your location page.

How do I cancel or reschedule a Quest Diagnostics appointment?

You can cancel or reschedule via the scheduling link in your confirmation email, by calling the location directly, or by using the online scheduling tool.

For anyone searching “Quest Diagnostics near me,” the network is vast and the process straightforward — but understanding the difference between doctor-ordered and self-ordered testing, and knowing the typical result times, can save you time and confusion. The key takeaway: use the official location search with a ZIP code, schedule an appointment for priority service, and check the hours to avoid wasted trips.