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Calculates urine albumin-to-creatinine ratio (ACR) for CKD screening and staging.
ACR = Urine Albumin (mg/L) ÷ Urine Creatinine (g/L)
<30 mg/g
Persistent albuminuria for at least 3 months is one of the diagnostic criteria for chronic kidney disease.
Specialty
NephrologyCategory
NephrologyDifficulty
Basic
Estimated Time
30 seconds
Version
1.0
Last Updated
2026-07
Formula
Keywords
Normal Range
<30 mg/g
| Classification | Range |
|---|---|
A1 | <30 mg/g |
A2 | 30–300 mg/g |
A3 | >300 mg/g |
Quantifies urine albumin relative to urine creatinine to screen for and stage chronic kidney disease (albuminuria categories A1–A3).
ACR < 30 mg/g is normal to mildly increased albuminuria (A1), 30–300 mg/g is moderately increased (A2), and > 300 mg/g is severely increased (A3). Albuminuria should be interpreted together with eGFR, and persistent elevation for at least 3 months supports a diagnosis of CKD. Pediatric reference values and pregnancy-specific criteria differ and require age- and pregnancy-appropriate interpretation.
ACR is a cornerstone of CKD screening and staging; it detects early kidney damage before eGFR declines and independently stratifies cardiovascular and renal risk.
A 52-year-old man with type 2 diabetes has a spot urine albumin of 250 mg/L and urine creatinine of 1.0 g/L.
Inputs:
ACR = 250 / 1.0 = 250 mg/g, indicating moderately increased albuminuria (A2). Repeat measurement is needed to confirm persistence.
The Albumin-to-Creatinine Ratio estimates the amount of albumin excreted in urine while correcting for urine concentration using creatinine.
ACR is one of the earliest markers of kidney damage and is recommended for screening chronic kidney disease, especially in patients with diabetes or hypertension.
An ACR below 30 mg/g is considered normal or mildly increased (A1).
Persistent albuminuria should be confirmed with at least two abnormal measurements over a period of three months.
Disclaimer: This calculator is intended for educational and clinical decision support purposes only. Persistent albuminuria and the diagnosis of CKD require confirmatory testing over at least 3 months alongside eGFR.
Persistent albuminuria is one of the earliest indicators of chronic kidney disease and should always be interpreted together with eGFR.
Detects and stages albuminuria.
Estimates glomerular filtration rate.
Medication dose adjustment.
Legacy GFR equation.