Albumin Creatinine Ratio: What Your Number Means

Find the ratio on your report and check its units. A urine albumin concentration by itself is a different measurement. Read UACR alongside eGFR and previous results; the ratio alone cannot identify the cause of an abnormal result. [1,2]

Read the result in the unit your laboratory reports

The KDIGO monitoring grid separates albuminuria into these categories. The mg/g and mg/mmol ranges are approximately equivalent clinical bands. [3]

A result of 40 mg/g belongs to A2; 40 mg/mmol belongs to A3. Comparing both numbers with the same cutoff would misread one of them.

Why the albumin concentration can look normal while the ratio is high

The ratio compares urine albumin with urine creatinine, which helps account for how concentrated the sample is. Both measurements come from urine; serum creatinine on a blood panel is not the denominator. NIDDK gives the calculation as urine albumin in mg/dL divided by urine creatinine in g/dL. [1]

This example uses those units:

Dividing 2.4 by 80 without converting creatinine to grams gives 0.03, which is not the reported mg/g ratio. Use the laboratory's calculated UACR when available.

A new high result needs confirmation and context

An elevated result from a random sample can be followed with a first-morning midstream sample. Chronic kidney disease requires evidence lasting at least three months; one isolated ratio is not enough for a diagnosis. [3]

For people with diabetes, ADA's 2026 guidance uses two abnormal results out of three samples within three to six months to establish elevated albuminuria. It also identifies recent exercise, infection, fever, menstruation, heart failure, markedly high blood sugar and markedly high blood pressure as possible temporary influences. [4]

Tell the ordering clinician about these circumstances when arranging the repeat. Avoid intense exercise for 24 hours before collection and follow the laboratory's collection instructions. [2]

Compare UACR with eGFR before assigning risk

Consider two illustrative results with the same eGFR of 55 mL/min/1.73 m²:

The second example is not in the grid's very-high-risk category. These groups guide follow-up; they are not an individual's percentage chance of kidney failure. Age, cause, trajectory and other findings still matter. [3]

A low UACR does not rule out every kidney condition. It describes albumin leakage in that sample. eGFR and other findings can still be abnormal. [1,2]

An elevated UACR can also matter when eGFR is above 60. Preserved filtration does not cancel evidence of albumin leakage. [2]

What can change an elevated ratio

Treatment follows the diagnosis. ADA's diabetes guidance includes ACE inhibitors or ARBs, SGLT2 inhibitors, finerenone and GLP-1 medicines for appropriate groups with kidney disease. Blood pressure, eGFR, potassium and other treatment factors determine the choice; one high ratio is not enough to select a medication. [4]

Do not interpret weight-loss percentages as a promised UACR improvement. In the STEP kidney analysis, UACR was assessed in STEP 2 participants with type 2 diabetes, not STEP 1. Semaglutide 2.4 mg produced a 20.6% fall from baseline at 68 weeks, compared with an 18.3% increase on placebo. This does not separate the effect of weight loss from the medication's other effects. [5]

For the next appointment, bring the report with its units, earlier UACR and eGFR results, and medication list. Ask what needs confirming, what could explain the change and when the next measurement should be taken.