Albumin in Urine
Análisis de orinaÚltima revisión: 7 de abril de 2026. Enfoque de fuentes: contexto estándar de interpretación de laboratorio, material médico de referencia y orientación clínica o de salud pública cuando corresponde.
¿Qué es Albumin in Urine?
Albumin is the most abundant protein in the blood, produced by the liver and responsible for maintaining fluid balance and transporting hormones, vitamins, and medications throughout the body. Healthy kidneys filter waste from the blood while keeping essential proteins like albumin in circulation. When small amounts of albumin begin leaking into the urine—a condition known as microalbuminuria—it is one of the earliest detectable signs that the kidney's filtering units (glomeruli) are damaged.
A urine albumin test measures the amount of albumin present in a urine sample, typically expressed as milligrams per liter or as an albumin-to-creatinine ratio (ACR) to account for urine concentration. This test is a cornerstone of preventive screening in people with diabetes, hypertension, and other conditions that place the kidneys at risk. Detecting albumin in urine early allows for interventions that can slow or prevent the progression to chronic kidney disease and kidney failure.
Por qué importa
Albumin in urine is one of the earliest warning signs of kidney damage, often appearing years before kidney function measurably declines. In people with diabetes, persistent microalbuminuria significantly increases the risk of progressing to diabetic nephropathy and end-stage renal disease. Albuminuria is also an independent risk factor for cardiovascular disease, stroke, and heart failure. Early detection and treatment—typically through blood pressure control, blood sugar management, and medications like ACE inhibitors—can dramatically slow kidney damage progression.
Rangos de referencia normales
| Grupo | Rango | Unidad |
|---|---|---|
| Normal | <30 | mg/g creatinine (ACR) |
| Microalbuminuria | 30–300 | mg/g creatinine (ACR) |
| Macroalbuminuria | >300 | mg/g creatinine (ACR) |
Los rangos de referencia pueden variar entre laboratorios. Compara siempre tus resultados con los rangos proporcionados por tu laboratorio.
Qué significan los niveles altos de uAlb
Causas comunes
- Diabetic nephropathy
- Hypertension-related kidney damage
- Glomerulonephritis
- Lupus nephritis
- Preeclampsia during pregnancy
- Heart failure
- Urinary tract infection (transient elevation)
Posibles síntomas
- Foamy or frothy urine
- Swelling in the hands, feet, or face (edema)
- Fatigue
- Decreased urine output
- High blood pressure
- Often asymptomatic in early stages
Qué hacer: If albumin is detected in your urine, your doctor will typically repeat the test to confirm the result, as transient factors like intense exercise, fever, or urinary infection can temporarily elevate levels. Persistent albuminuria warrants blood pressure optimization, blood sugar control in diabetics, and possible initiation of ACE inhibitors or ARBs to protect kidney function. Regular monitoring every 3–6 months is recommended.
Qué significan los niveles bajos de uAlb
Causas comunes
- Normal finding—healthy kidneys should produce very little urinary albumin
- Well-controlled diabetes and blood pressure
- Effective treatment with kidney-protective medications
Posibles síntomas
- No symptoms—low or undetectable urine albumin is the expected healthy result
Qué hacer: Low or absent urine albumin is a normal and healthy result. Continue regular screening if you have risk factors such as diabetes or hypertension. Maintain a healthy lifestyle with controlled blood pressure and blood sugar to keep kidneys functioning optimally.
¿Cuándo se recomienda la prueba de uAlb?
- Annually if you have type 1 or type 2 diabetes
- Annually if you have high blood pressure
- When there is a family history of kidney disease
- If you notice foamy urine or unexplained swelling
- During pregnancy to screen for preeclampsia
- To monitor known chronic kidney disease progression
Preguntas frecuentes
Biomarcadores relacionados
Lectura relacionada
Condiciones
Referencias y enfoque de revisión
Las páginas del glosario de biomarcadores son explicaciones educativas y deben interpretarse junto con los rangos de referencia y comentarios proporcionados por tu laboratorio y tu profesional de salud. Para conocer nuestros estándares editoriales y proceso de revisión, consulta nuestra Política editorial y nuestro Proceso de revisión de contenido.
¿Quieres analizar tus niveles de uAlb?
Sube tus resultados de laboratorio para recibir un análisis instantáneo con IA de todos tus biomarcadores.
Subir resultados de laboratorio →Aviso médico: Esta información es solo educativa y no sustituye el consejo, diagnóstico ni tratamiento médico profesional. Los rangos de referencia pueden variar entre laboratorios. Consulta siempre a tu profesional sanitario para interpretar tus resultados concretos.