Overview
Albumin serum is the most abundant serum protein and plays a central role in maintaining plasma colloid osmotic pressure. It is a relatively small globular protein synthesized exclusively in the liver at a rate of about 15 grams per day in adults.
Albumin serum readily equilibrates between the intravascular and extravascular compartments and is present in fluids such as interstitial fluid, cerebrospinal fluid, urine, and amniotic fluid. Its half-life is approximately 20 days, and synthesis is regulated mainly by colloid osmotic pressure and nutritional status.
Symptoms
Abnormal serum albumin levels do not cause symptoms directly, but underlying disorders may produce clinical features. Low albumin levels are commonly associated with edema, ascites, pleural effusion, fatigue, muscle wasting, and poor wound healing.
Patients may also present with features of liver disease, kidney disease, malnutrition, or chronic illness. Raised albumin levels are usually asymptomatic and often reflect dehydration rather than true overproduction.
Causes
Reduced serum albumin is most commonly caused by decreased hepatic synthesis, increased loss, or increased catabolism. Liver-related causes include cirrhosis, hepatitis, chronic inflammation, sepsis, malignancy, and impaired synthesis after surgery or acute infection. Renal causes include nephrotic syndrome and chronic kidney disease, where albumin is lost in urine.
Other causes include malnutrition, malabsorption, protein-losing enteropathies, burns, hemorrhage, and acute phase reactions.
Increased serum albumin is usually due to hemoconcentration from dehydration, excessive diuresis, vomiting, diarrhea, or prolonged tourniquet application during blood collection. Excessive albumin infusion and anabolic steroid therapy may also raise levels.
Risk Factors
Risk factors for hypoalbuminemia include chronic liver disease, kidney disease, poor nutritional intake, chronic infections, malignancy, heart failure, and prolonged hospitalization. Elderly individuals, patients with chronic inflammatory conditions, and those with gastrointestinal or renal protein loss are particularly susceptible. Dehydration, severe fluid loss, and improper sample collection techniques increase the likelihood of falsely elevated albumin levels.
Prevention
Prevention of abnormal albumin serum levels focuses on early identification and management of underlying conditions. Adequate nutrition, timely treatment of liver and kidney diseases, and control of chronic infections help maintain normal albumin levels. Proper hydration and correct blood collection techniques reduce false elevations. Regular monitoring of serum albumin aids in assessing disease severity, nutritional status, and response to treatment, improving overall patient outcomes.
