How to Call Quest Diagnostics to Schedule or Manage Your Appointment

The main Quest Diagnostics customer service number is 1-866-QUEST-LAB (1-866-787-3852)

This number connects you to Quest's central appointment line, where you can schedule a new test, reschedule an existing appointment, or ask questions about your visit. The line is available Monday through Friday, 7 a.m. to 7 p.m. Eastern time, and Saturday 8 a.m. to 4 p.m. Eastern time. Sunday hours vary by location.

When you call, have your insurance card and any lab order from your doctor ready. If you're rescheduling, have your current appointment confirmation number available — it speeds up the process. The representative can tell you which Quest location nearest you has availability and whether you need to fast before your test.

Quest also operates a separate phone line for results and account questions: 1-866-697-8378. This line is for checking on test results you've already completed, updating your contact information, or asking about billing. It's available during the same hours as the appointment line.

Key Takeaways

• Call 1-866-QUEST-LAB (1-866-787-3852) to schedule, reschedule, or cancel a Quest Diagnostics appointment.
• The appointment line operates Monday through Friday 7 a.m. to 7 p.m. Eastern, and Saturday 8 a.m. to 4 p.m. Eastern.
• Have your insurance card and doctor's lab order ready when you call to speed up scheduling.
• Use 1-866-697-8378 to check test results or update your account information after your visit.
• Many Quest locations also allow online scheduling through their website if you prefer not to call.

What to expect when you call the appointment line

A representative will ask for your name, date of birth, and contact information. They'll also ask what type of test your doctor ordered — for example, a blood draw, drug screening, or physical exam. If you don't have your lab order in front of you, the representative can sometimes look it up using your doctor's name and your date of birth, though this takes longer.

Once they confirm what you need, they'll show you available time slots at Quest locations near your zip code. You can choose the date and time that works for you. The representative will confirm your appointment over the phone and usually send a confirmation email or text message with your appointment details, location address, and any preparation instructions (like fasting).

If you're calling to reschedule or cancel, have your confirmation number ready. You can reschedule to a different date and time at the same location, or request a different location if that's more convenient. Cancellations can usually be made up to 24 hours before your appointment.

Online scheduling as an alternative to calling

Quest Diagnostics' website allows you to schedule appointments without calling. Go to questdiagnostics.com, select "Schedule an Appointment," enter your zip code, and browse available times at nearby locations. You'll need your insurance information and doctor's lab order number (if you have one) to complete the booking online.

Online scheduling is often faster than calling, especially during busy times. You receive an immediate confirmation with your appointment details, location address, and parking or check-in instructions. If you need to reschedule later, you can do that online as well through your Quest account.

However, if you have questions about what test you need, whether you should fast, or whether your insurance will cover the test, calling is usually more helpful because a representative can answer those questions in real time.

What to bring to your Quest appointment

Bring a photo ID and your insurance card. If you have a lab order from your doctor, bring that too — either the physical paper or a photo of it on your phone. If you don't have the order, Quest can sometimes contact your doctor's office to retrieve it, but this can delay your visit.

If your appointment requires fasting (usually for blood glucose or lipid tests), don't eat or drink anything except water for 8 to 12 hours before your appointment. The representative who scheduled you will tell you if fasting is required. Wear loose, comfortable clothing that allows easy access to your arm if you're having blood drawn.

Arrive 10 to 15 minutes early to allow time for check-in. Quest locations are usually busy during morning hours, so if you have flexibility, scheduling an afternoon appointment often means shorter wait times.

If you can't reach the appointment line

If the phone line is busy or you're calling outside business hours, you have a few options. Quest's website allows 24/7 online scheduling, so you can book an appointment any time without waiting for the phone line to open. You can also visit a Quest location in person and ask to schedule your next appointment at the front desk.

Some employers and insurance plans offer their own scheduling portals that connect directly to Quest. Check your insurance card or your employer's benefits website to see if you have access to a dedicated scheduling tool. These portals sometimes show availability faster than the main Quest website.

If you have an urgent question about a test result or a medical concern, don't wait for the appointment line. Contact your doctor's office instead — they can advise you on whether you need immediate care or can wait for your scheduled appointment.

Regional Quest Diagnostics phone numbers

The main number 1-866-QUEST-LAB works nationwide, but some regions have local Quest offices with their own phone lines. These local numbers are usually listed on your appointment confirmation or on the Quest website when you search for locations near you. Calling a local number can sometimes connect you faster to someone familiar with that specific location's hours and availability.

If you're scheduling an appointment at a Quest location inside a hospital or medical clinic, that facility may have its own scheduling number. Check your doctor's referral paperwork or call your doctor's office — they can give you the direct number for the location where your test is scheduled.

Frequently Asked Questions

Can I schedule a Quest appointment without a doctor's order?

No, Quest requires a doctor's order or a referral for most tests. However, Quest does offer some wellness tests (like basic metabolic panels or lipid panels) that you can order directly without a doctor. Call 1-866-QUEST-LAB to ask which tests are available without an order, or check the Quest website for self-ordered test options.

What if I need to reschedule my appointment the day before or day of?

Call 1-866-QUEST-LAB as soon as possible. Rescheduling within 24 hours of your appointment is possible but may limit your available time slots, especially if you need a specific location. Online rescheduling through your Quest account may show more availability than the phone line during peak hours.

How long does it take to get my test results after my appointment?

Most Quest test results are available within 24 to 48 hours. Some routine tests come back the same day. You can check your results by calling 1-866-697-8378, logging into your Quest account online, or asking your doctor's office — they receive results at the same time you do.

Is there a charge to schedule an appointment by phone?

No, scheduling by phone is free. You only pay for the actual test itself, and the cost depends on your insurance coverage and the type of test. Ask the representative about the cost when you call, or check your insurance plan's coverage before your appointment.

What if I have insurance but don't have my card with me when I call?

You can schedule without your card by providing your name, date of birth, and insurance company name. However, you'll need to bring your actual card to your appointment for check-in. If you don't have your card at the appointment, Quest may ask you to pay out of pocket and submit a claim to your insurance later.