{"entity":{"id":"quest-diagnostics","kind":"company","name":"Quest Diagnostics","aka":[],"tldr":"Quest Diagnostics is a national reference laboratory with oncology pathology and molecular testing, including Haystack Oncology MRD (acquired 2023).","summary":"Quest Diagnostics, based in Secaucus, New Jersey, and listed as DGX, is a national reference laboratory with oncology pathology and molecular testing, including the Haystack Oncology measurable residual disease test acquired in 2023. Its oncology work spans AmeriPath anatomic pathology, solid-tumour next-generation sequencing and circulating tumour DNA MRD testing through Haystack. OnCo links it to reference laboratories and companion diagnostic testing, MRD testing and Haystack Oncology. Whether a general reference laboratory can compete in MRD testing against specialist companies is the question the Haystack purchase poses. Haystack Oncology has its own page.","asOf":"2026-09-08","links":[{"label":"Official website","url":"https://www.questdiagnostics.com"}],"tags":["supporting"],"related":[],"cancers":[],"sections":["diagnostics"],"technologies":["reference-laboratories","mrd-testing"],"targets":[],"drugs":[],"companies":["haystack-oncology"],"institutions":[],"pathways":[],"terms":[],"trials":[],"people":[],"bottlenecks":[],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"hq":"Secaucus, NJ","country":"US","companyType":"diagnostics","website":"https://www.questdiagnostics.com","ticker":"DGX","investors":[],"funding":[]},"route":"/companies/quest-diagnostics/","neighbours":{"section":[{"id":"diagnostics","kind":"section","name":"Diagnostics & Biomarkers","route":"/fronts/diagnostics/"}],"technology":[{"id":"mrd-testing","kind":"technology","name":"MRD / molecular residual disease testing","route":"/technologies/mrd-testing/"},{"id":"reference-laboratories","kind":"technology","name":"Reference laboratories and companion-diagnostic testing","route":"/technologies/reference-laboratories/"}],"company":[{"id":"haystack-oncology","kind":"company","name":"Haystack Oncology","route":"/companies/haystack-oncology/"}]}}