How to Cancel a LabCorp Appointment

The fastest way to cancel is by phone or your online account

You can cancel a LabCorp appointment through three main routes: by phone to the location directly, through your LabCorp online account if you booked there, or in person at the lab itself. Phone cancellation is usually fastest — most locations answer within a few minutes during business hours. If you booked online through LabCorp.com or the LabCorp app, you can also log in and cancel from your appointment dashboard without calling.

The key detail: canceling before 24 hours notice is usually possible without penalty, but some locations may charge a no-show fee if you don't cancel at all. Policies vary slightly by location, so if you're close to your appointment time, calling is safer than assuming the online system will process in time.

Key Takeaways

• Call the specific LabCorp location where your appointment is scheduled — the main customer service line can transfer you, but the lab itself can cancel faster.
• If you booked through LabCorp.com or the mobile app, log into your account and cancel from your appointment list to get instant confirmation.
• Canceling at least 24 hours before your appointment time avoids potential no-show fees at most locations.
• If you need to reschedule rather than cancel entirely, you can often do that in the same step — either online or by phone.

Finding the phone number for your specific location

The LabCorp main customer service line is 1-800-LAB-CORP (1-800-522-2676), but they will transfer you to your local lab. It's faster to call the location directly. You can find the phone number by going to LabCorp.com, clicking "Find a Lab," entering your zip code, and selecting your appointment location — the phone number appears on that location's page.

Your appointment confirmation email or text message also usually includes the lab's direct phone number. Check those first before calling the main line. When you call, have your appointment confirmation number ready — it speeds up the cancellation.

Canceling through your LabCorp online account

If you booked your appointment on LabCorp.com or through the LabCorp mobile app, you can cancel without calling. Log in to your account, go to "My Appointments," find the appointment you want to cancel, and select the cancel option. The system will ask you to confirm, and you'll get an instant confirmation on screen and via email.

This method works 24/7 and creates a record that you canceled rather than no-showed. If the appointment is within 24 hours, the online system may not allow cancellation — in that case, call the location directly to explain and request a manual cancellation to avoid a no-show fee.

What happens if you don't show up without canceling

Most LabCorp locations do not charge a fee for a no-show, but some do — policies differ by location and by the type of test. If you simply don't appear and don't cancel, the lab may flag your account, which could affect future scheduling or result in a charge. The safest approach is always to cancel rather than ignore the appointment.

If you miss an appointment and realize it later, call the location and explain. Many labs will waive a no-show fee if you contact them within a day or two, especially if it's your first miss.

Rescheduling instead of canceling

If you need to move your appointment to a different day or time rather than cancel it entirely, you can reschedule in the same step. Through your online account, select "Reschedule" instead of "Cancel" and pick a new time. By phone, tell the lab representative you want to reschedule, and they can often book you for a new slot while on the call.

Rescheduling is usually instant online and takes less than a minute by phone. If your preferred time slot is full, the lab can put you on a waitlist or suggest nearby dates and times.

Canceling an appointment ordered by your doctor

If your doctor ordered the test and sent it to LabCorp (rather than you booking directly), you can still cancel the appointment through LabCorp using the same methods above. However, your doctor's office will still have a record that the test was ordered. If you want the order canceled entirely — so your doctor doesn't follow up asking why you didn't go — contact your doctor's office as well.

Canceling the LabCorp appointment alone just means you didn't show up for that specific time slot. If your doctor ordered the test and you no longer need it, let your doctor know so they can close the order on their end.

Frequently Asked Questions

Will I be charged if I cancel less than 24 hours before my appointment?

Most LabCorp locations do not charge a cancellation fee regardless of timing. However, some locations may charge a no-show fee if you don't cancel at all. Canceling — even at the last minute — protects you from that fee. Call your specific location if you're unsure about their policy.

Can I cancel online if my appointment is tomorrow?

You can try, but the online system may not allow cancellation within 24 hours of your appointment time. If that happens, call the lab directly. Speaking to a person ensures the cancellation is recorded and you avoid a no-show fee.

What if I lost my appointment confirmation number?

You don't need it to cancel, but it helps. Call the location with your name, date of birth, and the appointment date and time. The lab can look you up and cancel without the confirmation number.

Do I need to tell my doctor if I cancel a LabCorp appointment they ordered?

Not immediately, but if your doctor ordered the test and you're canceling because you no longer need it, let them know so they don't follow up or reorder it. If you're just rescheduling to a different time, you don't need to contact your doctor.

Can I cancel through the LabCorp app the same way as the website?

Yes. Log into the LabCorp mobile app, go to "My Appointments," select your appointment, and choose cancel or reschedule. The process is identical to the website and gives you the same instant confirmation.