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Kidney Function
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Pending specialist review and validation.
This test measures a small amount of albumin, a blood protein, that can leak into your urine when the kidney filters are stressed or damaged. It focuses on low levels that are not picked up by standard urine protein tests, which is why it is often called microalbumin. The sample is usually a single, clean-catch urine specimen, often collected in the clinic or as a first morning sample.
Your care team uses this measurement to look for early signs of kidney injury, especially from conditions that can harm the kidneys over time. It is a screening and monitoring tool, not a diagnosis on its own, and it is often paired with other tests to give a fuller picture of kidney health.
Finding albumin in urine at low levels can be an early signal that the kidneys are under strain. Detecting this early allows steps to protect kidney function, such as adjusting blood pressure treatment, optimizing diabetes care, and addressing lifestyle factors. Early changes are often reversible or stabilizable when found promptly.
Clinicians commonly order this test if you have diabetes, high blood pressure, cardiovascular disease, or a family history of kidney problems. It is also used to track response to treatment and to help estimate overall kidney and heart risk together with other labs and your medical history.
If your result is within the expected range, your clinician may simply continue routine monitoring and focus on maintaining healthy blood pressure, blood sugar, and kidney friendly habits. A single normal result does not guarantee the future, so repeat testing at intervals may still be advised if you have risk factors.
If albumin is detected above expected levels, your clinician may repeat the test to confirm, obtain an albumin to creatinine ratio for greater accuracy, and check overall kidney function. Temporary factors like strenuous exercise, dehydration, menstrual contamination, urinary tract infection, or fever can raise results, so letting your clinician know about these helps avoid confusion. If elevation is confirmed, treatment may include medication adjustments and lifestyle changes, with follow up testing to gauge improvement.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Vigorous physical activity shortly before collection can temporarily raise urine albumin. Try to avoid heavy exercise the day before and the day of your urine sample unless your clinician advises otherwise.
Urinary tract infections, fever, or recent illness can increase albumin in urine for a short period. Testing may be deferred until you are well, or repeated after treatment to confirm a true result.
Blood or vaginal secretions can contaminate the sample and cause a falsely high value. Use a clean-catch midstream technique and consider collecting outside of menstrual days when possible.
Dehydration concentrates urine and can make albumin appear higher, while high fluid intake can dilute it. Your clinician may prefer a first morning sample or may use a ratio to creatinine to account for concentration.
Some medicines lower albumin in urine as part of kidney protection, such as ACE inhibitors, ARBs, and SGLT2 inhibitors. Others, like certain pain relievers in the NSAID class, can affect kidney function. Share all medicines and supplements with your clinician.
In some people, especially adolescents and young adults, being upright during the day can increase albumin in urine. A first morning sample after lying down overnight may help clarify this pattern.
Normal physiology in pregnancy changes kidney filtration and urine composition. Your clinician may use pregnancy specific tests or interpret results differently during prenatal care.
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