The serum zinc levels and urinary zinc outputs before and after a middle severity operative trauma were investigated. The serum zinc concentration dropped markedly 6 hr after operation in both supplemented and nonsupplemented groups. It gradually returned to near normal without exogenous supplies of zinc. Provision of therapeutic doses of zinc could not prevent the abrupt dip of the serum zinc level. The possible mechanism of such changes are discussed briefly. (Journal of Parenteral and Enteral Nutrition9:196-198, 1985)
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