🧪 Urine Albumin-Creatinine Ratio (ACR) Calculator
Input microalbumin and creatinine concentration to measure microalbuminuria ratio.
What the ACR test measures
The urine albumin-to-creatinine ratio (ACR, also called UACR) shows how much albumin, a blood protein, is leaking into the urine. Healthy kidneys let very little through. Dividing albumin by creatinine corrects for how concentrated the urine is, so a single spot sample (ideally the first one in the morning) can be used instead of a 24-hour collection.
How to enter your values
- Enter urine albumin (microalbumin) in mg/dL and urine creatinine in mg/dL. The result is in mg/g.
- If albumin is reported in mg/L, divide by 10 to get mg/dL.
- If your lab already reports the ACR in mg/mmol, you don’t need this calculator: multiply by 8.84 to get mg/g.
Categories (KDIGO)
- A1, below 30 mg/g: normal to mildly increased.
- A2, 30–300 mg/g: moderately increased (previously called microalbuminuria).
- A3, above 300 mg/g: severely increased.
Things that raise ACR temporarily
- Hard exercise in the previous 24 hours, fever or infection (including urinary infection), menstruation, very high blood sugar or blood pressure.
- Because of this, one raised result is usually repeated before any conclusion is drawn.
ACR is checked regularly in people with diabetes or high blood pressure because a rising value can be an early sign of kidney damage. Combined with eGFR it gives the KDIGO risk category; see the CKD stage calculator.
Educational estimate only. Please discuss your result with your doctor.