Guardant Health, Inc, based in Redwood City, California, is a leader in liquid-based cancer tests for clinical and research use. The company offers Guardant360 LDT, a liquid biopsy test for treatment selection in advanced stage cancer, Guardant360 CDx, an FDA-approved companion diagnostic for several targeted therapies, and Guardant OMNI, a broader gene panel for immuno-oncology research. In 2021, Guardant launched Reveal, a tumor-agnostic molecular residual disease, or MRD, test. In 2022, the company launched a lab-developed test version of Shield, a liquid biopsy for colorectal cancer, or CRC, screening. Additionally, Guardant offers research development services such as regulatory approval consultancy and clinical trial referrals.