Urine Albumin
Albumin is a small protein that normally stays in your blood. Healthy kidneys let very little of it slip into the urine, so urine albumin is a sensitive marker of how well the kidney's filters are working.
Rising albumin in the urine is one of the earliest signs of kidney stress, often before other blood tests change. Because it can appear years before symptoms, it's a key screening tool in conditions like diabetes and high blood pressure.
More albumin in the urine can indicate the kidney's filters are leaking, which may relate to diabetes, high blood pressure, or other kidney conditions. Temporary rises can also follow intense exercise, fever, or infection, so results are usually confirmed on a repeat test.
Low urine albumin is the normal, reassuring result and suggests the kidney's filtering barrier is intact.
Little to no albumin in the urine is normal. Because levels vary, your clinician often relies on the albumin/creatinine ratio and repeats testing before concluding anything about kidney health.
Sources
- Albumin Blood (Serum) Test - MedlinePlus
- Albuminuria: Albumin in the Urine - National Kidney Foundation
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.