Albumin is the major component of plasma proteins.. [1,2] It modulates microvascular permeability, maintains oncotic pressure, acts as a buffer, transports cations, prevents platelet aggregation and assists with binding toxins. [2] Albumin binds to drugs and has a significant effect on the half-life and action of these drugs. [2] In addition, serum albumin is used in assessment of the nutritional status of both acute and chronically ill patients. [3] Total body albumin measures about 3.5-5.0 g/kg of body weight. [2] The plasma compartment contains 42% of the total body albumin, the rest being in the extravascular components. [2] The liver controls the synthesis of albumin, and the rate of synthesis is controlled by nutritional intake more than other hepatic proteins. [2] Therefore, fasting reduces albumin synthesis, but omitting protein from the diet causes a greater decrease in albumin synthesis. [2] The degradation of albumin is about 14 g/day, or 5% of daily whole-body protein turnover in a 70 kg adult. [2] The rate of synthesis and degradation and the distribution of albumin between the intravascular and extravascular compartments is altered in the critically ill. [2] There is often a dramatic decrease in serum albumin concentration during critical illness. [2] Serum albumin levels increase as recovery from illness progresses. [2] The alteration of albumin distribution in critical illness is related, at least in part, to an increase in capillary leakage due to a dysfunction of the endothelial barrier. [2] This occurs after major surgical stress and during sepsis, and results in leakage of, and loss of proteins into the interstitial space. [2] A number of studies have attempted to describe the incidence of hypoalbuminaemia and determine if there is an association between hypoalbuminaemia and outcome. [4-11] These studies have varied in their populations, definitions of hypoalbuminaemia and outcomes of interest. [4-11] The frequency of hypoalbuminaemia in adult hospitalised patients (serum albumin levels <35 g/L) has been reported to be 21% at the time of admission. Herrmann et al. [4] reported an association between low serum albumin within 48 hours of admission and increased length of stay (LOS) and in-hospital mortality. Similar findings were reported in surgical populations. [5,6] A preoperative albumin level of <40 g/L