Introduction to the concept of effective albumin concentration.

This article focuses on the concept of effective albumin concentration (eAlb), which refers to the structurally and functionally intact form of albumin, as opposed to total albumin concentration (tAlb) routinely reported by clinical laboratories that includes both functional and dysfunctional albumin. Albumin's diverse biological roles—such as antioxidant activity, molecule binding, and detoxification—can be impaired by posttranslational modifications occurring during manufacturing or in disease states like decompensated liver disease, leading to discrepancies between tAlb levels and clinical effectiveness. Studies in patients with cirrhosis have shown that eAlb correlates better with disease severity and prognosis than tAlb, and that commercially available albumin products often contain higher proportions of dysfunctional albumin. While eAlb holds potential for improving clinical assessment and treatment strategies, its measurement currently requires specialized techniques not available in routine clinical practice, and further research is needed to validate its clinical utility and explore interventions to restore albumin functionality.