Hypoalbuminemia is a condition that occurs when the level of albumin in the blood is too low, typically below 3.4 g/dL (grams per deciliter). The normal blood albumin level ranges from 3.4 to 5.4 g/dL.
Albumin is a protein produced by the liver and released into the bloodstream. It makes up a significant portion of blood plasma, the liquid component of blood that carries proteins and blood cells.
As the main protein in blood plasma, albumin plays several important roles, including maintaining pressure within blood vessels and transporting substances throughout the body, such as hormones and medications. Therefore, when albumin levels are low, the blood may not be able to transport essential substances effectively.
It is important to note that when liver function is normal, the body can compensate for low albumin levels by increasing albumin production in the liver. Hypoalbuminemia usually develops only when the rate of albumin loss exceeds the liver’s ability to produce it.
Symptoms of Hypoalbuminemia
People with hypoalbuminemia may experience a wide range of symptoms, such as confusion, dizziness, and low energy levels, particularly if malnutrition is present.
Common symptoms include:
•    Excess protein in the urine detected during urinalysis.
•    Fluid retention causing swelling, especially in the feet, legs, or hands.
•    Jaundice (yellowing of the skin or eyes).
•    Weakness or fatigue.
•    Rapid heartbeat.
•    Vomiting, diarrhea, and nausea.
•    Changes in appetite.
•    Thinning hair.
•    Dry and itchy skin.
It is important to note that these symptoms can resemble those of many other conditions, making it impossible to diagnose hypoalbuminemia based on symptoms alone.
Causes and Risk Factors of Hypoalbuminemia
A variety of health conditions can cause hypoalbuminemia. Identifying the underlying cause is essential for determining the most appropriate treatment.
1. Liver Failure
The liver is the body's only source of albumin production. For this reason, albumin testing is often included in liver function assessments.
Several liver diseases can lead to liver failure, including:
•    Cirrhosis.
•    Liver cancer.
•    Hepatitis, often caused by viral infections.
•    Alcohol-related liver disease.
•    Fatty liver disease.
2. Kidney Disease
Poor kidney function, particularly chronic kidney disease (CKD), can lead to low albumin levels.
Kidney disorders may cause excessive amounts of protein to leak into the urine, a condition known as albuminuria. This loss of protein from the bloodstream can result in hypoalbuminemia.
3. Heart Failure
Some individuals with severe heart failure have reduced albumin levels, although the exact reason for this association is not fully understood.
4. Malnutrition
Failure to consume enough essential nutrients or conditions that impair nutrient absorption can lead to hypoalbuminemia.
Some people undergoing chemotherapy may also develop malnutrition.
5. Protein-Losing Enteropathy
Certain gastrointestinal diseases, such as celiac disease and inflammatory bowel disease (IBD), can cause excessive protein loss through the digestive tract.
This may result in a condition known as protein-losing enteropathy, which can lower albumin levels.
6. Thyroid Disorders
Various thyroid diseases can affect the immune system and contribute to decreased albumin levels.
7. Whipple Disease
Whipple disease is a rare bacterial infection that affects the joints and digestive system, reducing the body's ability to digest and absorb nutrients. In these cases, albumin levels may fall below normal.
8. High-Protein Diets
Some studies have reported lower albumin levels in individuals whose diets contain extremely high amounts of protein.
9. Other Causes
People may also develop hypoalbuminemia as a result of:
•    Severe burns.
•    Bloodstream infections (sepsis).
•    Allergic reactions.
•    Lupus.
•    Diabetes.
•    Certain medications, including oral contraceptive pills.
Complications of Hypoalbuminemia
Potential complications include:
•    Worsening of other underlying diseases. For example, a 2015 study found that people with chronic obstructive pulmonary disease (COPD) and hypoalbuminemia were more likely to develop respiratory failure.
•    Fluid accumulation, including fluid around the lungs and in the abdomen.
•    Pneumonia.
•    Muscle damage and muscle wasting.
•    Reduced effectiveness of certain medications that require albumin for transport in the bloodstream.
Diagnosis of Hypoalbuminemia
A blood albumin test (ALB) is commonly recommended when liver or kidney dysfunction is suspected.
Albumin testing is also included in the Comprehensive Metabolic Panel (CMP), a routine test that evaluates blood sugar levels, liver function, kidney function, and overall metabolic health.
The test is performed by drawing a blood sample from a vein in the arm. It is generally safe, with only minor discomfort from the needle and possible mild bruising at the puncture site.
If abnormal results are found and kidney, liver, or intestinal disease is suspected, additional imaging studies and diagnostic tests may be required. A review of dietary habits and medications may also be performed.
Treatment of Hypoalbuminemia
The most effective treatment for hypoalbuminemia is addressing the underlying cause. Therefore, patients may require several tests to determine why albumin levels are low.
Additional treatment strategies may include:
•    Intravenous albumin administration to increase blood albumin levels.
•    Blood pressure medications for people with kidney disease or heart failure.
•    Lifestyle modifications, particularly avoiding alcohol in people with liver disease.
•    Medications to manage chronic gastrointestinal disorders or reduce inflammation.
•    Antibiotics for patients who develop hypoalbuminemia following severe burns.
•    Dietary modifications to reduce the severity of heart or kidney disease.
•    Organ transplantation for patients whose hypoalbuminemia is caused by organ failure. Individuals with kidney failure may require dialysis while waiting for a kidney transplant.
People with severe hypoalbuminemia may need hospitalization and close monitoring until their condition improves.
Prevention of Hypoalbuminemia
1. Follow a Healthy Diet
Consuming adequate protein, at least 0.8 grams per kilogram of body weight per day, helps support normal albumin production.
Foods rich in protein include:
•    Meat.
•    Milk.
•    Cheese.
•    Eggs.
•    Fish.
•    Greek yogurt.
Some nutritional supplements and meat substitutes may also contain albumin or high-quality protein.
However, certain underlying diseases may impair the absorption and use of albumin and other nutrients. As a result, hypoalbuminemia can still occur despite adequate protein intake.
2. Limit Alcohol Consumption
Doctors generally recommend reducing or completely avoiding alcohol consumption, as alcohol can lower blood protein levels and worsen symptoms.
3. Treat Underlying Medical Conditions
Managing underlying diseases can help prevent hypoalbuminemia. For example, people with kidney disease may benefit from blood pressure medications such as Captopril, which can help reduce albumin loss through the urine.