Albumin in Nutrition Assessment and Disease Severity

Introduction to Albumin's Role

The American Journal of Kidney Diseases suggests that serum albumin is a strong predictor of mortality and morbidity, but it should not be interpreted in isolation as a nutritional marker due to its influence by inflammation, illness, liver disease, volume status, and protein losses 1, 2, 3

Serum albumin is one of the best predictors of illness or death in patients with end-stage kidney disease (ESKD), with each 0.1 g/dL decrease associated with a 6% increase in death risk and 5% increase in days hospitalized 1, 3
Lower albumin concentrations (<3.5 g/dL) are associated with higher odds of mortality over 10 years (OR 2.34, 95% CI 1.33-4.10) 1, 3

Inflammatory cytokines directly downregulate albumin synthesis in the liver, causing hypoalbuminemia even when protein and caloric intake are adequate 1, 2, 4
Albumin is a negative acute-phase reactant—serum levels decline during inflammation or infection regardless of nutritional status 1, 6, 4

Inflammation and acute illness: C-reactive protein and other positive acute-phase proteins are inversely correlated with serum albumin levels 4
Liver disease: Cirrhosis and chronic liver disease impair albumin production 1, 2, 4
Volume expansion: Hemodilution from excess fluid decreases serum albumin concentration, particularly common in dialysis patients 1, 4
Protein losses: Urinary losses (nephrotic syndrome), dialysate losses (peritoneal dialysis), or gastrointestinal losses all contribute to hypoalbuminemia 1, 2, 4

The National Kidney Foundation's Kidney Disease Outcomes Quality Initiative (KDOQI) recommends that biomarkers such as serum albumin should be considered complementary tools to assess nutritional status but should not be interpreted in isolation 3
In adults with CKD 5D on maintenance hemodialysis, serum albumin may be used as a predictor of hospitalization and mortality (Grade 1A evidence) 3

An individual with predialysis or stabilized serum albumin <30 mg/dL (for prealbumin) should be evaluated for protein-energy malnutrition 6
Albumin <3.5 g/dL warrants evaluation for both malnutrition and inflammatory processes 1
Albumin <38 g/L is significantly associated with higher mortality and morbidity 1

Monitor serum albumin at least every 4 months in dialysis patients 4
More frequent monitoring is recommended during acute illness or when albumin is declining 4
Evaluate albumin in context of peritoneal transport type and delivered dialysis dose 4
Target ≥0.9 g/kg/day of normalized protein nitrogen appearance (nPNA) in dialysis patients 4