Contact Us

If you have questions or need assistance, our teams are available and committed to providing the best support we can.

CORPORATE HEADQUARTERS

3100 Hanover Street
Palo Alto, CA 94304

LABORATORY ADDRESS

505 Penobscot Drive
Redwood City, CA 94063

Telephone: 855.698.8887
Fax: 888.974.4258

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Shield HCP Screening Support can also be reached toll free at: 855.722.7335

Our Whistleblower hotline can also be reached at guardanthealth.ethicspoint.com or toll free at: 833.220.9672

Shield Patient Support can also be reached toll free at: 855.722.7335

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