Microalbumin (urine)
Microalbumin is a small amount of the protein albumin in the urine. Healthy kidneys let almost no albumin through, so its presence is an early sign that the kidney filter has begun to leak.
| Rating | Range | What it means |
|---|---|---|
| Good | below 30 mg/L | Within range — the kidney barrier is intact. |
| Worth improving | 30 – 300 mg/L | Microalbuminuria — monitor (kidneys/heart). |
| Talk to a doctor | 300 mg/L and above | Albuminuria — consult (kidneys). |
Why it matters
Per KDIGO, key for detecting and classifying kidney disease (categories A1–A3); also linked to cardiac risk.
If it’s low
Low/normal microalbumin is favorable — the kidney filter is intact.
If it’s high
Elevated microalbumin means the kidney filter is leaking protein — an early sign of strain, often due to diabetes or high blood pressure. It is also an indicator of cardiovascular risk.
What to do
Control of blood pressure and sugar is crucial — it often reverses early damage. Confirm with a repeat (rule out transient causes, e.g. infection/exercise).
Read together with
eGFR · Creatinine · Fasting glucose
Articles about this marker
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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