<prompt> Among patients who require nutritional resuscitation in an intensive care unit, the best evidence that nutritional support is adequate isUrinary nitrogen excretion levelsTotal serum protein levelSerum albumin levelSerum transferrin levels  <response>: The serum albumin level provides a rough estimate of protein nutritional adequacy. The accuracy of this estimate is affected by the long half-life of albumin 3 week and vagaries of hemodilution. The acute-phase serum proteins have a very short half-life hours and may also provide good short-term indications of nutritional status. Transferrin is one of these acute-phase proteins, but unfortunately its levels too are influenced by changes in intravascular volume and, along with the other acute-phase reactants, rise nonspecifically during acute illness. All the listed responses provide some useful information about nutrition and adequacy of replacement. 