{"id":"d-dimer","name":"D-Dimer (FEU)","shortName":"D-Dimer","aliases":["D-Dimer","D-Dimer Quantitative","Fibrin D-Dimer","DDimer","D-Dimer, Quant","Dimero D","D Dimer","D-Dimer FEU","D-Dimer, Quantitative (FEU)","D-Dimer, Plasma","Fibrin D-Dimer, Quantitative","D-Dimer (Fibrinogen Equivalent Units)","D-Dimer Test"],"abbreviations":[],"loinc":[{"code":"48065-7","primary":true},{"code":"48067-3","primary":false},{"code":"111766-2","primary":false}],"specimen":"plasma","units":[{"ucum":"ng/mL{FEU}","display":"ng/mL FEU"},{"ucum":"ug/L{FEU}","display":"µg/L FEU"},{"ucum":"ug/mL{FEU}","display":"µg/mL FEU"},{"ucum":"mg/L{FEU}","display":"mg/L FEU"}],"referenceRanges":[{"population":"Adults","low":null,"high":500,"unit":"ng/mL{FEU}","unitDisplay":"ng/mL FEU","note":"Mayo Clinic Laboratories reports 500 ng/mL FEU or lower, which is also the usual cutoff for helping rule out a clot in someone with symptoms. ARUP lists 0.0–0.4 µg/mL FEU (up to 400 ng/mL FEU) and states that its assay is not intended to rule out a clot. Quest reports in µg/mL FEU, uses a cutoff of 0.5 µg/mL FEU (the same as 500 ng/mL FEU) and does not print a separate reference interval. Reference values (from healthy people) and clinical cutoffs can differ, and assays are not standardized, so use the cutoff and units on your own report. For adults 50 and older, an age-adjusted cutoff of age × 10 ng/mL FEU (for example 700 at age 70) is used by many clinicians when ruling out a clot in a person with symptoms. D-dimer rises with age and in pregnancy, so a lab's usual range can flag results that are typical for these groups.","sources":[{"title":"D-Dimer, Plasma (test DDITT)","url":"https://www.testcatalog.org/show/DDITT","publisher":"Mayo Clinic Laboratories (Extended Catalog)"},{"title":"D-Dimer (ARUP test 0030057)","url":"https://ltd.aruplab.com/Tests/Pub/0030057","publisher":"ARUP Laboratories"},{"title":"D-dimer test frequently asked questions (Quest test code 8659)","url":"https://www.questdiagnostics.com/healthcare-professionals/clinical-education-center/faq/faq149","publisher":"Quest Diagnostics Clinical Education Center"},{"title":"Facts and Misfacts on D-Dimer Testing. Consensus Guidance From the Italian Society on Thrombosis and Hemostasis (SISET)","url":"https://pubmed.ncbi.nlm.nih.gov/41017435/","publisher":"American Journal of Hematology","year":2025},{"title":"Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study","url":"https://pubmed.ncbi.nlm.nih.gov/24643601/","publisher":"JAMA","year":2014},{"title":"Croatian Society of Medical Biochemistry and Laboratory Medicine: National recommendations for blood collection, processing, performance and reporting of results for coagulation screening assays prothrombin time, activated partial thromboplastin time, thrombin time, fibrinogen and D-dimer","url":"https://pubmed.ncbi.nlm.nih.gov/31223257/","publisher":"Biochemia Medica","year":2019},{"title":"D-dimer Test","url":"https://medlineplus.gov/lab-tests/d-dimer-test/","publisher":"MedlinePlus (National Library of Medicine)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A blood test for fragments left when a clot breaks down, used to help rule out a blood clot and to follow clotting problems such as DIC.","url":"https://bloodtesttracker.com/markers/d-dimer","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}