How to Change or Cancel a LabCorp Appointment

You can change your LabCorp appointment online, by phone, or through the LabCorp app

The fastest way to reschedule is through your LabCorp account on their website or mobile app — you can move your appointment to a different time or location without talking to anyone. If you prefer to call, LabCorp's appointment line can make the change for you, though wait times vary by location. You'll need your appointment confirmation number or date of birth to identify your booking either way.

How much notice you need to give depends on your location and how busy that lab is. Most LabCorp locations let you change an appointment up until the day before, but some accept changes on the same day if there's availability. If you're cancelling rather than rescheduling, the same methods work — just select cancel instead of reschedule.

Key Takeaways

• Log into your LabCorp account online or open the LabCorp app to reschedule without calling; the change takes effect immediately.
• Call your local LabCorp location directly or use the main LabCorp appointment line if you don't have online access or prefer phone support.
• Most locations allow changes up to the day before your appointment, but same-day changes may be possible if slots are open.
• Have your appointment confirmation number or date of birth ready when you call, so the staff can find your booking quickly.
• If you're changing to a different LabCorp location, check that the new location offers the same test your doctor ordered.

Rescheduling through your LabCorp online account

Start by going to labcorp.com and signing into your account with your username and password. Once you're logged in, look for "Appointments" or "Schedule an Appointment" — the exact wording varies slightly depending on whether you're on desktop or mobile. Click on your upcoming appointment and you'll see options to reschedule or cancel.

When you reschedule, you can pick a new date and time at the same location or switch to a different LabCorp lab nearby. The system will show you available slots in real time. Once you confirm the new time, you'll get an updated confirmation number by email or text, depending on how you set up your account notifications. This whole process usually takes two to three minutes.

If you don't have a LabCorp account yet, you can create one during the rescheduling process — you'll need your email address and the phone number associated with your original appointment booking.

Changing your appointment by phone

Call LabCorp's main appointment line at 1-800-LAB-CORP (1-800-522-2676). Have your appointment confirmation number ready — it's on your confirmation email or text. If you don't have that number, the staff member can look up your appointment using your date of birth and phone number.

Tell them the new date and time you want, and whether you need to stay at the same location or move to a different one. They'll check availability and confirm the change right away. You'll receive a new confirmation by email or text within a few minutes. If you're calling a specific LabCorp location directly instead of the main line, wait times are often shorter during off-peak hours — early morning or late afternoon tend to be quieter than midday.

Using the LabCorp mobile app

Download the LabCorp app on your phone and log in with the same username and password you use on the website. Tap "My Appointments" at the bottom of the screen. Your upcoming appointment will appear with options to reschedule or cancel displayed right below it.

The app works the same way as the website — you pick a new date, time, and location from available slots, and your confirmation updates instantly. Many people find the app faster than the website because it's designed for quick changes on the go. You can also use the app to check in for your appointment on the day you go, which can speed up the check-in process at the lab.

What to do if you need to cancel instead of reschedule

If you need to cancel your appointment entirely rather than move it to a different time, the process is the same through any method — online, app, or phone. Select "Cancel" instead of "Reschedule" and confirm. You don't need to provide a reason, and there's no penalty for cancelling.

If you cancel and later decide you want the test done, you can schedule a new appointment whenever you're ready using the same online or phone methods. Keep in mind that if your doctor ordered the test for a specific reason — like monitoring a condition or following up on lab results — cancelling delays that information. If you're unsure whether you should keep the appointment, a quick call to your doctor's office can help you decide.

Changing to a different LabCorp location

LabCorp has thousands of locations across the country, and you can move your appointment to a different lab if the original time or place doesn't work for you. When you reschedule online or by phone, you'll see a list of nearby locations with available times. Pick the one that's most convenient.

The one thing to check: make sure the new location offers the specific test your doctor ordered. Most LabCorp locations run the same common tests — blood work, urinalysis, drug screening — but some specialized tests are only available at certain labs. When you're picking a new location, the system will show you whether that location can do your test. If it can't, you'll need to pick a different location or keep your original appointment.

Same-day changes and last-minute rescheduling

If you need to reschedule on the day of your appointment, it's often possible but not may provide. Availability depends on how busy that LabCorp location is and whether other people have cancelled. Your best bet is to call the specific location directly rather than using the main line — they can tell you immediately if they have an open slot later that day.

If no same-day slots are available, you can reschedule for the next day or later in the week. If your test is urgent or time-sensitive, mention that when you call — the staff may be able to fit you in or point you toward a location with more availability. If you simply don't show up for your appointment without cancelling, LabCorp may flag your account, which can make scheduling future appointments more complicated.

Frequently Asked Questions

Can I change my appointment if I don't have my confirmation number?

Yes. Call LabCorp or log into your online account, and they can look up your appointment using your date of birth and phone number. Having the confirmation number speeds things up, but it's not required.

What if I need to reschedule but LabCorp's website is down?

Call the main LabCorp appointment line at 1-800-522-2676 or your local LabCorp location directly. Phone lines stay open even when the website is temporarily unavailable, and staff can reschedule you right away.

Will I lose my test results or doctor's order if I reschedule?

No. Your test order stays active in the system, and rescheduling doesn't affect it. When you go to your new appointment, the lab will have all the same information they would have had at your original time.

Can I reschedule if my appointment is tomorrow?

Usually yes, but it depends on the location's schedule. Try rescheduling online or call the specific lab to see if they have availability. Same-day or next-day changes are often possible, especially if you're flexible about the time.

What happens if I miss my rescheduled appointment?

If you don't show up without cancelling, LabCorp may place a hold on your account that makes future scheduling harder. If you know you can't make it, cancel or reschedule instead of missing it. If something unexpected comes up, call as soon as you can to reschedule.