“…This phenomenon is thought to confer some advantage to the host; for example, sequestration and peripheral uptake of zinc and iron may ensure maximization of their availability for essential metabolic processes. 5 Nevertheless, certain parameters are generally monitored (see the article by Anna E. Martinez elsewhere in this issue for further exploration of this topic). Frequency of sampling depends on disease severity and the need to evaluate the impact of intervention, such as nutrient supplementation or introduction of an alternative feeding method, for example, gastrostomy placement.…”