Urine albumin-to-creatinine ratio, or ACR, can detect albumin leakage that a kidney blood test alone may miss. A raised result needs clinical interpretation and usually confirmation. One abnormal sample does not, on its own, establish chronic kidney disease.
Evidence checked 1 November 2026. Prepared by The Wellness Team.
What does urine ACR measure?
ACR compares the amount of albumin in urine with urine creatinine. Using a ratio helps account for how concentrated the sample is. It is a different measurement from blood albumin and from the blood creatinine used to estimate kidney filtration.
KDIGO recommends assessing people at risk of kidney disease using both urine albumin and glomerular filtration rate. Each adds information. A normal estimated filtration result should not be used to ignore a raised ACR, nor should a raised ACR be interpreted without the rest of the clinical picture.
Who might benefit from discussing this test?
People with kidney risk factors may benefit from a discussion about ACR alongside blood pressure and kidney blood tests. Diabetes, hypertension, previous kidney problems and relevant family history can change the assessment.
That is not a case for adding every possible test to every executive screen. Ask what question the test is intended to answer and what the clinician would do differently with the result. A purposeful smaller assessment can be more useful than an unexplained large panel.
Does one raised ACR mean chronic kidney disease?
No. KDIGO cautions against assuming chronicity from a single abnormal ACR or estimated filtration result. Chronic kidney disease requires evidence of an abnormality persisting for at least three months or other evidence establishing chronicity.
This does not mean every abnormal result should simply be left for three months. The severity, symptoms, previous results and possibility of acute illness determine how quickly the clinician should investigate. Confirmation and prompt care can proceed together when needed.
How is a raised result confirmed?
KDIGO advises confirming a raised ACR from a random sample with a subsequent first-morning, midstream sample. It also recommends quantitative laboratory confirmation when a less accurate strip test detects albumin or protein.
Follow the collection instructions supplied for your test. Tell the clinician about urinary symptoms, current illness, recent strenuous activity and anything else that could affect the sample. A repeat should answer a specific clinical question rather than become an automatic extra purchase.
How do units change the interpretation?
Check the units before comparing results. UK laboratories commonly report ACR in mg/mmol; other reports may use mg/g. Numbers written in different units are not directly interchangeable.
Bring the original report with its reference information, collection date and previous measurements. A screenshot with the number alone can hide details that matter. Ask the clinician to explain both the category and what it means for your next step, rather than relying on a colour-coded flag.
What happens if albumin leakage persists?
Persistent albuminuria should prompt assessment of its cause and the wider kidney and cardiovascular risk picture. Further blood tests, repeat urine testing, medication review or specialist advice may be appropriate depending on the findings.
Do not start supplements, stop prescribed medicines or dramatically alter fluid intake to make the number look better. The goal is to protect health and establish a cause, not improve a dashboard. Discuss the result with The Wellness if you need a clinician to bring your records together.
What should an executive screening plan promise?
It should promise a clear process, not a guaranteed normal result. Ask whether repeat testing and review are included, what would trigger referral and how urgent findings are communicated. If your employer funds the assessment, clarify clinical confidentiality before results are shared.
Severe illness, markedly reduced urine output, breathlessness or significant swelling should not wait for routine screening. Seek prompt clinical advice. For a stable incidental result, a documented confirmation plan is a more valuable outcome than either alarm or dismissal.
Sources and evidence limits
This guide explains evidence and questions for a consultation. It does not diagnose your condition or confirm that a test or procedure is appropriate for you.
What should I do next?
Discuss an individual assessment with The Wellness. Bring your previous results, medicines and the question you want answered. Ask for a written plan and quote before deciding to proceed.