• Shailesh Bihari, Jonathan Bannard-Smith, and Rinaldo Bellomo.
• Intensive and Critical Care Unit, Flinders Medical Centre, Adelaide, SA, Australia. biharishailesh@gmail.com, Shailesh.Bihari@sa.gov.au.
• Crit Care Resusc. 2020 Sep 1; 22 (3): 257265257-265.

AbstractAlbumin is the most abundant and perhaps most important protein in human blood. Research has identified many of albumin's possible roles in modulating acid-base balance, modifying inflammation, maintaining vascular endothelial integrity, and binding endogenous and exogenous compounds. Albumin plays a key role in the homeostasis of vascular endothelium, offering protection from inflammation and damage to the glycocalyx. Albumin binds a diverse range of compounds. It transports, delivers and clears drugs, plus it helps with uptake, storage and disposal of potentially harmful biological products. The biological effects of albumin in critical illness are incompletely understood, but may enhance its clinical role beyond use as an intravenous fluid. In this article, we summarise the evidence surrounding albumin's biological and physiological effects beyond its use for plasma volume expansion, and explore potential mechanistic effects of albumin as a disease modifier in patients with critical illness.

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