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Anna Röll
Albumin: what it is and what its levels say about your health
Albumin is a protein produced by the liver that plays a central role in transporting substances in the blood and maintaining fluid balance in the body. It helps carry hormones, fatty acids, and medications, while also keeping fluid from leaking out of blood vessels into surrounding tissues. Albumin levels can be measured both in blood and in urine, and these values provide important insights into the condition of the liver and kidneys. Understanding what albumin is and what your levels mean can help you detect potential health issues early—even if you don’t yet have symptoms.
Table of Contents
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What is albumin and why is it an important health indicator?
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What are the consequences of long-term abnormal albumin levels?
What is albumin and why is it an important health indicator?
Albumin is a protein made by the liver that is found in the blood. Albumin is an important clinical marker because it reflects several essential functions in the body. It is produced by the liver, helps keep fluid inside the blood vessels, and transports substances such as hormones, vitamins, and enzymes.
Albumin levels in the blood provide insight into overall health, including liver function, kidney function, and nutritional status. Low levels may indicate liver disease, kidney disease, or poor nutrition, while high levels are often linked to dehydration.
If the kidneys are damaged, they may allow albumin to leak from the blood into the urine. Measuring albumin is therefore useful for evaluating and monitoring underlying health conditions.
Source: National Library of Medicine, 2024
What are normal albumin levels?
Albumin in blood (serum)
|
Category |
Value (Albumin Level) ( g/dL) |
|
Normal (adults) |
3.5–5.5 |
Important: Reference values may vary slightly between laboratories. Always have your results interpreted by a doctor or healthcare professional.
Source: Cleveland Clinic, 2024
Albumin in urine (ACR: Albumin-to-Creatinine Ratio)
|
Category |
Males (mg/mmol) (ACR levels) |
Females (mg/mmol) (ACR levels) |
|
Normoalbuminuria (normal) |
<2.5 |
<3.5 |
|
Microalbuminuria |
2.5–25.0 |
3.5–35.0 |
|
Macroalbuminuria |
>25.0 |
>35.0 |
Source: Australian Bureau of Statistics, 2015
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Normoalbuminuria: Normal. No significant albumin in urine; kidneys are functioning well.
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Microalbuminuria: Slightly elevated. Early sign of kidney damage.
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Macroalbuminuria: High. Indicates more advanced kidney damage.
Important: Reference values may vary slightly between laboratories. Always have your results interpreted by a doctor or healthcare professional.
What causes abnormal albumin levels?
Abnormal albumin levels can occur in different ways, and each pattern has its own meaning. Low or high levels in the blood, as well as elevated levels in urine, can point to different underlying conditions. Below is an overview of the most common causes.
Signs of low albumin in blood
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Liver diseases (e.g., cirrhosis, hepatitis, fatty liver disease)
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Kidney disease (loss of albumin via urine)
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Malnutrition, especially low protein intake
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Infections
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Digestive disorders affecting protein absorption (e.g., Crohn’s disease, malabsorption)
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Extensive burns
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Thyroid disease
Source: National Library of Medicine, 2024
Signs of high albumin in blood
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Dehydration (most common cause, e.g., due to severe diarrhea)
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Medication use (e.g., steroids, insulin, or hormone treatments)
Source: National Library of Medicine, 2024
Causes of albumin in urine
Albumin in urine (albuminuria) is caused by damage to the kidney’s filtering system (the glomeruli). This can be temporary or long-term, depending on the underlying cause.
Common chronic (long-term) causes:
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Diabetes (especially when blood sugar is poorly controlled)
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High blood pressure (hypertension)
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Heart disease or heart failure
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Chronic kidney or glomerular diseases (e.g., glomerulonephritis)
Common temporary (short-term) causes:
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Dehydration
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Intense physical exercise
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Fever or infection
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Acute worsening of heart failure
Temporary increases are often harmless, but persistent albumin in urine requires further medical evaluation.
Source: National Kidney Foundation, 2023
What are the consequences of long-term abnormal albumin levels?
Persistently abnormal albumin levels can have significant health consequences. Chronically low albumin in the blood can lead to fluid buildup, poor wound healing, increased susceptibility to infections, and overall physical weakness. These effects can develop gradually and worsen over time if the underlying cause is not addressed (National Library of Medicine, 2024) .
Long-term albumin in the urine (albuminuria) indicates ongoing kidney damage and is associated with serious complications. Persistently elevated levels increase the risk of kidney failure, cardiovascular disease (including heart attack and stroke), heart failure, and decreased life expectancy. The higher the albumin level over time, the greater the risk of these complications (National Kidney Foundation, 2023) .
What can you do if your albumin level is abnormal?
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Ensure balanced diet
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Limit alcohol
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Stay well hydrated to support overall bodily function
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Maintain a healthy weight and engage in regular physical activity
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Keep blood pressure and blood sugar under control, especially if you have hypertension or diabetes
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Stop smoking and/or tobacco products
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Consult your doctor if abnormalities persist or if you experience symptoms such as foamy urine, puffiness around the eyes (especially in the morning), frequent urination (peeing more often than usual), swelling (of your feet, ankles, belly area, or face)
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Always seek medical advice if you have concerns, and never adjust medication on your own without consulting a healthcare professional.
Source: National Kidney Foundation, 2023
How can you test albumin?
Albumin can be measured in two main ways.
A blood test (serum albumin) measures the amount of albumin in your blood and helps assess liver and kidney function, as well as nutritional status. Albumin also plays a key role in maintaining fluid balance and transporting substances in the body.
A urine test, usually the albumin-to-creatinine ratio (ACR), measures the amount of albumin in your urine to evaluate how well your kidneys are working. Higher levels of albumin in urine may indicate kidney damage.
Source: National Kidney Foundation, 2018; Cleveland Clinic, 2024
To check liver and kidney function from the comfort of your home, Homed-IQ offers a convenient test kit. This test measures albumin in the urine as an indicator of kidney function. It also analyzes other important markers of liver function, giving you a comprehensive picture of the health of these organs. For more information and to order, please click here: Liver and Kidney Function Test from Homed-IQ.
Frequently asked questions about albumin
What does “albumin negative” in urine mean?
It means little to no albumin is present in the urine, which is considered normal. Albumin is a protein that is usually found in the blood, not in urine. Healthy kidneys act as filters that prevent albumin from passing into the urine, so this result indicates that the kidneys are functioning properly and not leaking protein (National Kidney Foundation, 2023).
What is the difference between microalbuminuria and macroalbuminuria?
Microalbuminuria refers to small amounts of albumin in the urine, often an early sign of kidney damage. Macroalbuminuria is a higher level and indicates more advanced kidney involvement (Australian Bureau of Statistics, 2015).
How reliable is a spot urine test compared to a 24-hour test?
A spot urine test (ACR) is the preferred method because it corrects for variations in urine concentration and is more convenient. Although 24-hour urine collection has traditionally been the gold standard, spot testing correlates well with 24-hour results and is easier to perform (National Kidney Foundation, n.d.; Melbourne Pathology, 2009).
When should I return to my doctor after an abnormal result?
If your result is abnormal, your doctor will usually recommend a repeat test within a few weeks to confirm. Persistent abnormalities require further evaluation.
Can temporary factors affect albumin levels in urine?
Yes, factors such as intense exercise, dehydration, fever, or infections can temporarily increase albumin levels. These are usually not concerning unless the findings persist (National Kidney Foundation, 2023)
Can diet influence albumin levels?
Yes, especially in the blood. Malnutrition can lead to decreased albumin levels, while proper nutrition supports normal levels (National Library of Medicine, 2024).
Is albumin testing only for people with health conditions?
No, it can also be useful as part of a general health check. Early detection of abnormalities can help prevent future health issues.
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