A medical fluid for a harvested organ, tissue or parts thereof, for evaluation and/or preservation. The fluid includes cocaine or a stimulating analogue thereof; nor-adrenalin; and/or adrenaline. In addition, the fluid includes an oncotic agent, such as dextran; hormones, such as thyroxin; triiodotyronine; cortisone, insulin; and electrolytes and optionally nutrients in substantially physiological concentrations in a physiologically acceptable medium. In addition, the medical fluid further includes albumin in a concentration not exceeding 5.0%, and an oxygen carrier, such as erythrocytes. Further components may be dopamine; hydrocortisone; methylprednisolone; and a vasopressor agent, such as desmopressin. The cocaine; adrenalin; and noradrenaline are present in concentrations of each about 0.010 μM to 0.100 μM, for example in a ratio of 1:1:1.