At DLO, we are happy to provide 24/7 customer support to patients and healthcare professionals across the state. Whether you’re a patient with questions about a bill or invoice, or a healthcare professional needing clarification on a test or specimen requirements, we always have someone available to assist you.

Click here for Patient Service Center locations


General Inquiries:
(405) 608-6100
Toll Free: 1 (800) 891-2917

Billing Questions:
1 (866) 254-3859

Email Billing Customer Service

MyQuest Support


Client Services & General Inquiries:
Oklahoma City: (405) 608-6100, Option 2
Toll Free: 1 (800) 891-2917, Option 2

Specimen Pick Up:
Oklahoma City: (405) 608-6100, Option 3
Toll Free: 1 (800) 891-2917, Option 3

Client Billing:
1 (888) 321-0155

IT Support Help Desk:
1 (800) 697-9302

Oklahoma City: (405) 608-6100, Option 4
Toll Free: 1 (800) 891-2917, Option 4

Download the Supply Request Form

Oklahoma City: (405) 608-6100, Option 5
Toll Free: 1 (800) 891-2917, Option 5

Diagnostic Laboratory of Oklahoma **
225 NE 97th St.
Oklahoma City, OK 73114

** This location is our company headquarters and is NOT a draw site. Please visit our Patient Service Center Locations page to find the draw site nearest to you.

Send a Message to DLO

Are you a patient with a question regarding a DLO bill or invoice? Send a message to the DLO patient billing department by clicking the link below:

Email Billing Customer Service

If your question does not relate to patient billing, please use the form below to submit a message to DLO. We greatly value the voice of our patients and health care providers.