Information about a laboratory test
High UACR can indicate albumin leakage from the kidneys; exercise, infection and temporary conditions can affect results, so repeat testing may be needed.
Assesses urine albumin loss by comparing albumin with creatinine in a spot urine sample.
Used with eGFR to screen and monitor kidney damage, especially in people with risks such as diabetes or hypertension.
A low/normal UACR generally indicates less albumin leakage, but kidney assessment should not rely on this test alone.
High UACR can indicate albumin leakage from the kidneys; exercise, infection and temporary conditions can affect results, so repeat testing may be needed.
Start with the performing laboratory's reference interval, unit and specimen conditions. Numeric information on this page is stored as sourced example intervals or clinical thresholds.
< 30 mg/g
A1: normal to mildly increased
This is one of the albuminuria A categories used in CKD assessment. Interpret it with eGFR and chronicity; a single abnormal measurement may need confirmation.
>= 30 – <= 300 mg/g
A2: moderately increased
This is one of the albuminuria A categories used in CKD assessment. Interpret it with eGFR and chronicity; a single abnormal measurement may need confirmation.
> 300 mg/g
A3: severely increased
This is one of the albuminuria A categories used in CKD assessment. Interpret it with eGFR and chronicity; a single abnormal measurement may need confirmation.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
UACR and eGFR complement each other in CKD risk classification. One abnormal measurement does not prove chronic disease.
Albumin Blood (Serum) Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Albumin meaning and adult example interval · Verified: Aug 12, 2026
Creatinine Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Creatinine limitations and use with eGFR, BUN and urine testing · Verified: Aug 12, 2026
Chronic Kidney Disease Tests & Diagnosis — National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
U.S. government medical reference · 2026 · eGFR and urine albumin/UACR as key kidney tests; broad interpretation thresholds · Verified: Aug 12, 2026
How to Classify CKD — National Kidney Foundation
Professional clinical reference · 2026 · G1-G5 eGFR categories and A1-A3 albuminuria categories · Verified: Aug 12, 2026
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