Hypoalbuminaemia

Hypoalbuminaemia—low levels of albumin in the blood—is one of the most common reasons for reduced total protein on a blood test. It can reflect problems with the liver, kidneys, nutrition, or chronic inflammation, and often appears before any obvious symptoms develop.

Albumin is the main protein in the bloodstream, produced by the liver. It helps maintain fluid balance, transports hormones and medications, and plays a key role in overall metabolic function. As albumin levels drop, the body loses some of its ability to keep fluid within blood vessels, leading to fluid buildup in tissues and other systemic effects.

What Causes Low Albumin Levels?

Hypoalbuminaemia can result from several underlying mechanisms:

Reduced production (liver-related):
- Chronic liver disease (e.g., cirrhosis)
- Acute liver injury
Increased loss:
- Kidney disease (e.g., nephrotic syndrome)
- Protein-losing enteropathy
- Inflammatory bowel disease
- Severe burns or skin loss
Inflammation and illness:
- Chronic inflammation or infection
- Critical illness or trauma
Poor intake or absorption:
- Malnutrition
- Malabsorption syndromes

Because hypoalbuminaemia is often a marker of an underlying condition, identifying the cause is essential for proper treatment.

Key Biomarkers & Tests

Low albumin in a blood test is typically evaluated alongside other markers to determine the cause:

Serum albumin
Total protein
Liver function tests (AST, ALT, ALP, bilirubin)
Kidney markers (creatinine, eGFR)
Urine albumin or total protein
Inflammatory markers (e.g., CRP)

These patterns help distinguish whether low albumin is due to decreased production, increased loss, or systemic disease. Low albumin also reduces the calculated anion gap and can mask underlying acid-base abnormalities on a metabolic panel.

Symptoms of Low Albumin

Mild hypoalbuminaemia may not cause noticeable symptoms. As levels decline, symptoms of low albumin can include:

Fluid buildup or swelling, especially in the legs, ankles, or face
Abdominal fluid accumulation (ascites)
Fatigue and weakness
Muscle loss or weight changes
Delayed wound healing

Low albumin can also affect how medications behave in the body, as many drugs bind to albumin—potentially increasing the active (unbound) fraction of certain medications.

Complications

Persistently low albumin levels can contribute to:

Ongoing fluid imbalance
Increased susceptibility to infections
Poor healing and recovery
Worse outcomes in chronic liver or kidney disease
Higher risk of hospitalization in severe illness

Many of these complications can be detected early through regular lab monitoring—declining albumin, rising inflammatory markers, or worsening kidney and liver tests often signal disease progression.

Treatment & Management

Hypoalbuminaemia treatment focuses on identifying and correcting the underlying cause, while supporting overall recovery:

Address the underlying cause (e.g., liver disease, kidney disease, inflammation)
Provide nutritional and fluid management support
Treat infections or inflammatory conditions if present
Monitor recovery through follow-up albumin and related biomarkers

Albumin levels often improve as the underlying condition is treated. However, persistently low levels may indicate ongoing disease activity and require continued monitoring.