Johns Hopkins Medical Laboratories Services


Contact Customer Service

When to call: Call to order or schedule tests, confer with faculty specialists or handle processing and billing inquiries.

How to access: Simply call 1-800-997-5475
8:00am - midnight, 7 days/week. Professional and administrative staff can be reached between 8:30am and 5:00pm EST.

What to expect: The Customer Service Line is staffed by medical technologists who are familiar with tests or have immediate access to testing information.

They will:


Person working in the lab