{"id":"bun-creatinine-ratio","name":"BUN/Creatinine Ratio","shortName":"BUN/Cr Ratio","aliases":["BUN/Creat Ratio","BUN:Cr","BUN:Creatinine","BUN/CREA","Relación BUN/creatinina","BUN/Creatinine Ratio","BUN to Creatinine Ratio","BUN/Creatinine","BUN:Creatinine Ratio","BUN Creatinine Ratio","BUN/Creatinine Ratio, Calculated","BUN/CREAT RATIO","Ratio BUN/Creatinine","Relación nitrógeno ureico/creatinina"],"abbreviations":["BUN:Cr","BUN/Cr"],"loinc":[{"code":"3097-3","primary":true},{"code":"44734-2","primary":false}],"specimen":"calculated","units":[{"ucum":"{ratio}","display":"ratio"}],"referenceRanges":[{"population":"Men, 18–59","low":9,"high":20,"unit":"{ratio}","unitDisplay":"ratio","note":"Labcorp interval for men 18 to 59. Its sample report for a 62-year-old man prints 10–24, so the usual span moves up with age. No source I opened gives the cut-off age, so no range is set for 60 and older. Other labs use different spans.","sources":[{"title":"Pediatric Testing Reference Ranges (BUN/Creatinine Ratio, result 011577)","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp","year":2022},{"title":"Comp. Metabolic Panel (14), sample report (test 322000)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/322000.pdf","publisher":"Labcorp","year":2022}]},{"population":"Women, 18–59","low":9,"high":23,"unit":"{ratio}","unitDisplay":"ratio","note":"Labcorp interval for women 18 to 59. Other labs use different spans.","sources":[{"title":"Pediatric Testing Reference Ranges (BUN/Creatinine Ratio, result 011577)","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp","year":2022},{"title":"Basic Metabolic Panel (8), sample report (test 322758)","url":"https://files.labcorp.com/testmenu-d8/sample_reports/322758.pdf","publisher":"Labcorp","year":2022}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A calculated comparison of your BUN with your creatinine that clinicians use as one clue to why a kidney-related number is high or low.","url":"https://bloodtesttracker.com/markers/bun-creatinine-ratio","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}