{"id":"homocysteine","name":"Homocysteine","shortName":"Homocysteine","aliases":["HCY","Total Homocysteine","Homocyst(e)ine","Homocysteine, Total","Homocysteine, Plasma","Homocysteine, Cardiovascular","HOMOCYSTEINE, CARDIO","tHcy","Homocisteína","Homocystein","Homocysteine, Serum","Plasma Total Homocysteine","Homocysteine Total"],"abbreviations":["Hcy","HCY","tHcy"],"loinc":[{"code":"13965-9","primary":true},{"code":"2428-1","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"umol/L","display":"µmol/L"},{"ucum":"mg/L","display":"mg/L"}],"referenceRanges":[{"population":"18–60","low":null,"high":14.5,"unit":"umol/L","unitDisplay":"µmol/L","note":"Labcorp's upper limit for adults 18-60 years. ARUP uses 0-15 µmol/L for males and females without an age split, so labs differ by about 0.5 µmol/L at this age and more in older adults. Levels rise with age and are usually higher in men (MedlinePlus). Use the range printed on your report.","sources":[{"title":"Homocyst(e)ine (test 706994)","url":"https://labcorp.com/t/706994","publisher":"Labcorp"},{"title":"Homocysteine, Total (test 0099869)","url":"https://ltd.aruplab.com/Tests/Pub/0099869","publisher":"ARUP Laboratories"},{"title":"Homocysteine Test","url":"https://medlineplus.gov/lab-tests/homocysteine-test/","publisher":"MedlinePlus, National Library of Medicine"}]},{"population":"61–70","low":null,"high":17.2,"unit":"umol/L","unitDisplay":"µmol/L","sources":[{"title":"Homocyst(e)ine (test 706994)","url":"https://labcorp.com/t/706994","publisher":"Labcorp"}]},{"population":"71–80","low":null,"high":19.2,"unit":"umol/L","unitDisplay":"µmol/L","sources":[{"title":"Homocyst(e)ine (test 706994)","url":"https://labcorp.com/t/706994","publisher":"Labcorp"}]},{"population":"81+","low":null,"high":21.3,"unit":"umol/L","unitDisplay":"µmol/L","sources":[{"title":"Homocyst(e)ine (test 706994)","url":"https://labcorp.com/t/706994","publisher":"Labcorp"}]}],"review":{"status":"ai-draft","label":"AI-drafted. Awaiting verification","lastReviewed":"2026-10-03"},"summary":"Homocysteine is an amino acid your body clears with B vitamins. Higher levels can reflect low B12 or folate, kidney function, age or genetics.","url":"https://bloodtesttracker.com/markers/homocysteine","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}