OncoCyte Corporation operates as a precision diagnostics company in the United States and internationally. The company develops and commercializes laboratory developed tests, kitted research use only tests, and kitted clinical tests. It is developing DetermaCNI, a blood-based monitoring tool that detects progression early after one cycle cancer treatment; and DetermaIO, a gene expression test that assesses the tumor microenvironment to predict response to immunotherapies. The company also offers VitaGraft Kidney, a blood-based transplant monitoring test that quantifies the concentration of donor-derived cell-free DNA for kidney transplantation; VitaGraft Liver, a blood-based transplant monitoring test that quantifies the concentration of donor-derived cell-free DNA for liver transplantation; and GraftAssure, a dd-cfDNA test that uses droplet digital PCR technology to measure the concentration of dd-cfDNA using 48 predefined SNPs.