View details for your local Labcorp location in Petaluma, CA. Visit us for Laboratory Testing, Drug Testing, and Routine Labwork.

While appointments are encouraged, they are not required. Walk-ins are welcome. Go to your nearest Labcorp location at your convenience.

To schedule an appointment, go to Labcorp's Labs & Appointments page and search for the patient service center nearest you. Select your location, click "Schedule an Appointment" and follow the instructions. Please keep a copy of your confirmation number.

Sometimes special preparation is required to ensure your results are accurate. Your provider will share any preparation needed before your specific test. This may involve:

• - Fasting (not eating any or certain foods) for several hours or even overnight
• - Drinking more or less water than usual
• - Avoiding certain medications or vitamin and herbal supplements prior to testing

It is important to talk to your doctor about the medications you are currently taking (including supplements and other over-the-counter medications) before making changes prior to having laboratory tests performed.

If you have questions about preparing for your test, please reach out to the ordering provider.

A list of services performed at each location can be found within the detail page for each lab location (patient service center). You can also search by the "Any Service" drop-down menu on the Labs & Appointments page.