How do I contact Labcorp OnDemand®? May 04, 2023 16:47 Updated Contacting Labcorp OnDemand® is easy. You can email us at email@example.com or give us a phone call at (800) 833-3935. We are available to take your calls Monday- Friday from 8 am- 6 pm ET. Related articles How does Labcorp OnDemand® work? How do I get a physician order for testing? How do I create a Labcorp Patient Account? Will I be contacted about my results? Are my test results private and confidential?