The short answer: Microalbuminuria is the older term for moderately increased albuminuria, usually a urine albumin-to-creatinine ratio (UACR) of 30–299 mg/g. In someone with diabetes, it can be an early sign that the kidneys are being affected. But one elevated urine test does not automatically mean permanent diabetic kidney disease. Albuminuria can fluctuate, and in some people it can decrease substantially or even return to the normal range when the underlying factors are addressed. (Diabetes Journals)
What is microalbuminuria?
Healthy kidneys keep most albumin—a protein in your blood—from passing into the urine.
When the kidney’s filtering barrier becomes more leaky, more albumin can appear in urine. A UACR measures the amount of albumin relative to creatinine in a urine sample.
Current terminology generally uses:
- Normal to mildly increased: UACR <30 mg/g
- Moderately increased albuminuria: 30–299 mg/g
- Severely increased albuminuria: ≥300 mg/g
The term microalbuminuria is still commonly used, but moderately increased albuminuria is preferred because the condition involves a measurable increase in albumin, not necessarily a tiny amount. (Diabetes Journals)
Why does diabetes cause albumin in the urine?
Over time, diabetes can affect the tiny blood vessels and filtering structures inside the kidneys.
Persistently elevated blood glucose can contribute to kidney injury, while high blood pressure can place additional stress on the kidney’s filtering system. As kidney damage develops, albumin may begin appearing in the urine before a clear reduction in eGFR occurs. (Diabetes Journals)
That makes albuminuria an important early warning marker, but it is not proof by itself that permanent kidney damage has occurred.
What are the early warning signs?
The tricky part is that moderately increased albuminuria usually causes no physical symptoms.
You may feel completely normal.
Possible clues such as foamy urine can occur with protein in the urine, but foam is not a reliable way to diagnose albuminuria. Diabetes-related kidney disease is usually detected through urine testing and blood testing, rather than symptoms.
For people with diabetes, the important tests include:
- UACR: measures urine albumin
- eGFR: estimates how well the kidneys filter blood
- Blood pressure
- Blood glucose/A1C, when appropriate
The American Diabetes Association recommends at least annual UACR and eGFR assessment for people with type 2 diabetes and for people with type 1 diabetes after 5 years of disease. (Diabetes Journals)
Can microalbuminuria be reversed?
Sometimes, yes—but “reversible” needs careful interpretation.
Albuminuria can fall considerably with appropriate treatment, and remission can sometimes occur. A lower UACR is generally a favorable sign, but it does not necessarily mean that every underlying structural change in the kidneys has completely disappeared. (Diabetes Journals)
Several factors can reduce albuminuria, including appropriate management of:
- Blood glucose
- Blood pressure
- Diabetes-related kidney risk
- Excess sodium intake
- Smoking
- Excess body weight when relevant
- Medications that protect kidney function in appropriate patients
The goal is not simply to make one urine number look better. The broader goal is to reduce kidney and cardiovascular risk and preserve kidney function over time. (Diabetes Journals)
One high UACR does not automatically mean diabetic kidney disease
Urine albumin can vary substantially from one test to another.
Temporary increases can occur with factors such as illness, significant exercise, infection, high blood glucose, menstruation, or other circumstances. Hydration and urine concentration can also affect testing.
Because of this variability, the ADA recommends that two of three UACR measurements collected over 3–6 months be abnormal before diagnosing persistent moderately or severely increased albuminuria. (Diabetes Journals)
So if your first UACR is elevated, the sensible next question is often:
“Does this remain elevated when tested again?”
rather than assuming permanent kidney disease immediately.
What about eGFR?
UACR and eGFR answer different questions.
eGFR estimates how well your kidneys are filtering.
UACR indicates whether excess albumin is leaking through the kidney’s filtering barrier.
You can therefore have albuminuria while eGFR is still relatively preserved.
This is one reason someone should not assume that a normal creatinine or eGFR means the kidneys are completely unaffected by diabetes. Conversely, a single elevated UACR does not tell you how quickly kidney function will decline.
Looking at the trend over time is much more useful.
Can treatment lower albuminuria?
Yes. Several evidence-based treatments can reduce albuminuria and, in appropriate patients, lower the risk of kidney disease progression.
Blood pressure treatment
For people with diabetes, hypertension, and albuminuria, ACE inhibitors or ARBs are commonly used because they can reduce albuminuria and provide kidney and cardiovascular benefits in appropriate patients. (Diabetes Journals)
These medications can cause a modest change in creatinine after treatment begins. That does not automatically mean kidney damage. Kidney function and potassium should be monitored as directed by the treating clinician. (Diabetes Journals)
SGLT2 inhibitors
For appropriate people with type 2 diabetes and CKD, SGLT2 inhibitors can slow kidney disease progression and reduce cardiovascular risk. They can also lower albuminuria. (Diabetes Journals)
They are not appropriate for every person, and the choice depends on kidney function, other medical conditions, medications, and individual circumstances.
Finerenone
For selected people with type 2 diabetes, CKD, and albuminuria, finerenone—a nonsteroidal mineralocorticoid receptor antagonist—can reduce the risk of kidney and cardiovascular complications. Because it can increase potassium, monitoring is important. (Diabetes Journals)
These treatments should be selected and monitored by a healthcare professional rather than started or stopped based solely on a UACR result.
What can you do to protect your kidneys?
The practical priorities are straightforward:
- Keep blood glucose under appropriate control.
- Monitor and manage blood pressure.
- Have UACR and eGFR checked as recommended.
- Take prescribed kidney-protective medicines as directed.
- Avoid smoking.
- Follow an appropriate eating pattern rather than unnecessarily restricting foods.
- Maintain a healthy level of physical activity when medically appropriate.
- Track results over time rather than focusing on one urine test.
The right dietary plan depends on your kidney function, potassium, medications, diabetes control, weight, and other health conditions. A generic “kidney diet” is not appropriate for everyone.
When should you discuss an abnormal result with your doctor?
An elevated UACR deserves follow-up, particularly if it remains elevated on repeat testing.
Ask about:
- Your exact UACR
- Your eGFR
- Whether the UACR should be repeated
- Your blood pressure
- Your diabetes control
- Whether your medications are appropriate for your kidney risk
- Whether other causes of albuminuria need to be considered
Seek prompt medical attention for symptoms such as severe shortness of breath, very low urine output, severe swelling, confusion, chest pain, or severe vomiting/dehydration, rather than assuming these symptoms are simply caused by albuminuria.
Bottom line
Microalbuminuria is an important early warning sign in diabetes, but it is not necessarily permanent.
An elevated UACR should be confirmed and interpreted alongside eGFR, blood pressure, diabetes control, medications, and other clinical information. Albuminuria can decrease—and sometimes return to the normal range—but that does not mean it should be ignored.
The most useful goal is not simply to “reverse the number.” It is to reduce ongoing kidney stress, monitor trends, and protect kidney function over the long term. (Diabetes Journals)