{"id":"urea","name":"Urea","shortName":"Urea","aliases":["Urea","Serum Urea","Blood Urea","Urea, Serum","Urea, Plasma","Serum urea","Urea (Calculated)","Ureia","Urea sérica","Harnstoff","Urée","Urea, Serum or Plasma","Plasma Urea","Uréia","Uréia, soro","Ureia sérica","Urea en suero","Urée sérique","Serum Harnstoff"],"abbreviations":[],"loinc":[{"code":"3091-6","primary":true},{"code":"22664-7","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"mg/dL","display":"mg/dL"},{"ucum":"mmol/L","display":"mmol/L"},{"ucum":"g/L","display":"g/L"}],"referenceRanges":[{"population":"16+","low":2.5,"high":7.8,"unit":"mmol/L","unitDisplay":"mmol/L","note":"The adult interval used by most UK laboratories (Oxford, North West London, Newcastle and the ACB analyte guide); Oxford applies it from age 18. It depends partly on protein intake and muscle mass and tends to rise with age. Other labs differ. A German reagent maker lists 17 to 43 mg/dL (2.8 to 7.2 mmol/L) for adults, and Fleury in Brazil lists 10 to 50 mg/dL (about 1.7 to 8.3 mmol/L). Ranges differ somewhat between labs, methods and populations, and a lab's own printed range is the one to use.","sources":[{"title":"Urea (serum, plasma): analyte guide","url":"https://www.acb.org.uk/static/9c103fb7-8b28-4142-974319bf8be7f34e/urea0AAC953E882E.pdf","publisher":"Association for Clinical Biochemistry and Laboratory Medicine (author W. Marshall)","year":2012},{"title":"Urea (North West London Pathology test database)","url":"https://www.nwlpathology.nhs.uk/test/urea/","publisher":"North West London Pathology"},{"title":"Urea, serum (Newcastle Hospitals Laboratories test directory)","url":"https://laboratories.newcastle-hospitals.nhs.uk/test-directory/urea-serum/","publisher":"Newcastle upon Tyne Hospitals NHS Foundation Trust"},{"title":"Urea (Clinical Biochemistry test catalogue)","url":"https://www.ouh.nhs.uk/biochemistry/tests/tests-catalogue/urea/","publisher":"Oxford University Hospitals NHS Foundation Trust"},{"title":"Urea reference ranges","url":"https://www.diasys-diagnostics.com/service-area/support/reference-ranges/analyte/urea/analyte.show","publisher":"DiaSys Diagnostic Systems GmbH"},{"title":"Uréia, soro (Manual de Exames Fleury)","url":"https://www.fleury.com.br/medicos/exames/ureia-soro","publisher":"Fleury Medicina e Saúde"}]},{"population":"Men, 18–29","low":3,"high":7.5,"unit":"mmol/L","unitDisplay":"mmol/L","note":"Sonic Healthcare Australia reference values by age and sex (a guide; each lab sets its own). Levels rise with age and are slightly higher in men, partly because of muscle mass. Use the most specific row that fits; the 2.5 to 7.8 row is the fallback.","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Men, 30–49","low":3,"high":8,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Men, 50–59","low":3.5,"high":8.5,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Men, 60–69","low":3.5,"high":9,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Men, 70–79","low":3.5,"high":9.5,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Men, 80–89","low":4,"high":10,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Men, 90+","low":4.5,"high":10,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 18–29","low":2.5,"high":6.5,"unit":"mmol/L","unitDisplay":"mmol/L","note":"Sonic Healthcare Australia reference values by age and sex (a guide; each lab sets its own). Levels rise with age and are slightly higher in men, partly because of muscle mass. Use the most specific row that fits; the 2.5 to 7.8 row is the fallback.","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 30–49","low":2.5,"high":7,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 50–59","low":3,"high":8,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 60–69","low":3,"high":8.5,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 70–79","low":3.5,"high":9.5,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 80–89","low":3.5,"high":10,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]},{"population":"Women, 90+","low":4,"high":10,"unit":"mmol/L","unitDisplay":"mmol/L","sources":[{"title":"Urea, serum (reference values by age and sex)","url":"https://www.sonicbookings.com.au/our-tests/elft-euc-lft/urea/","publisher":"Sonic Healthcare Australia","year":2018}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Urea is the main waste product from breaking down protein. Your kidneys clear it from the blood.","url":"https://bloodtesttracker.com/markers/urea","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}