Serum Albumin – Values, Function & Clinical Significance
Serum albumin is the most abundant protein in human blood plasma, playing a vital role in transport and fluid balance. Low levels may indicate liver, kidney, or nutritional disorders.
Things worth knowing about "Serum Albumin"
Serum albumin is the most abundant protein in human blood plasma, playing a vital role in transport and fluid balance. Low levels may indicate liver, kidney, or nutritional disorders.
What Is Serum Albumin?
Serum albumin is the most abundant protein in human blood plasma, accounting for approximately 55–60% of all plasma proteins. It is exclusively synthesized in the liver and released into the bloodstream. Normal levels in healthy adults range from about 3.5 to 5.0 g/dL, and it plays a central role in many vital bodily functions.
Functions of Serum Albumin
Serum albumin performs several indispensable roles in the body:
- Maintaining colloid osmotic pressure: Albumin retains water within blood vessels, preventing fluid from leaking into surrounding tissues and causing edema.
- Transport function: It carries a wide range of substances through the bloodstream, including fatty acids, hormones (e.g., thyroid hormones), bilirubin, calcium, and numerous medications.
- Buffer function: Albumin helps maintain the acid-base balance of the blood.
- Antioxidant activity: It protects cells and tissues from oxidative damage.
Normal Values and Measurement
Serum albumin levels are measured through a routine blood test. Reference values for adults are typically between 3.5 and 5.0 g/dL. Values above this range (hyperalbuminemia) or below (hypoalbuminemia) can indicate various underlying conditions.
Causes of Low Serum Albumin (Hypoalbuminemia)
A reduced albumin level can have several causes:
- Liver disease: In conditions such as liver cirrhosis or chronic hepatitis, the liver's ability to synthesize albumin is impaired.
- Kidney disease: In nephrotic syndrome, albumin is lost through the urine.
- Malnutrition and undernutrition: Insufficient protein intake reduces albumin synthesis.
- Chronic inflammatory conditions: Inflammatory processes suppress albumin synthesis and increase its consumption.
- Burns and severe injuries: Significant protein loss through the skin or into surrounding tissue.
- Malabsorption syndromes: Conditions such as Crohn's disease or celiac disease impair protein absorption from the gut.
Causes of Elevated Serum Albumin (Hyperalbuminemia)
Elevated albumin levels are uncommon and are most frequently caused by dehydration. When blood volume decreases, the concentration of all proteins, including albumin, rises proportionally.
Clinical Significance and Diagnosis
Measuring serum albumin is an important component of laboratory diagnostics. Low albumin levels are recognized as a marker for:
- Malnutrition and poor nutritional status
- Severity of liver disease (e.g., Child-Pugh score)
- Prognosis in critically ill patients in intensive care units
- Degree of inflammatory activity (acute-phase reaction)
Albumin is typically evaluated alongside other parameters such as C-reactive protein (CRP), liver function tests, and kidney function markers to obtain a complete clinical picture.
Treatment of Albumin Deficiency
The treatment of low albumin always targets the underlying cause:
- Nutritional therapy: A high-protein diet is recommended for malnourished patients, supplemented by enteral or parenteral nutrition if necessary.
- Treatment of the underlying condition: Liver or kidney disease must be specifically addressed.
- Intravenous albumin infusion: In severe cases, such as liver cirrhosis with ascites or severe nephrotic syndrome, albumin can be administered directly as an intravenous infusion.
References
- Bluestone, H. et al. – Albumin in Clinical Practice. In: Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill, 2022.
- World Health Organization (WHO) – Nutritional Anaemias: Tools for Effective Prevention and Control. WHO Press, Geneva, 2017.
- Levitt, D. G. & Levitt, M. D. – Human serum albumin homeostasis: a new look at the roles of synthesis, catabolism, renal and gastrointestinal excretion. Clinical and Experimental Pharmacology and Physiology, 2016. Available at: https://pubmed.ncbi.nlm.nih.gov/27084891/
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