Abstract
Copper (Cu) is an essential trace element which is an important component of parenteral nutrition (PN). The Cu status of patients is difficult to assess, mainly because of the limitations of currently available laboratory tests. This can make it difficult to decide on the amount of Cu to provide in PN for individual patients. However, it is important to provide the correct amount if Cu deficiency and toxicity are to be avoided. This article provides guidance for nutrition support teams (NSTs) on assessing Cu status and estimating individual requirements in patients treated with PN.