Final answer:
Refeeding syndrome is characterized by low serum concentrations of Phosphorus, Potassium, and Magnesium, typically occurring in a malnourished individual who begins to refeed.
Step-by-step explanation:
Refeeding syndrome is characterized by low serum concentrations of Phosphorus, Potassium, Magnesium. This condition can occur when a person who has been malnourished begins to eat again. In the phase of malnourishment, the body's conservation of these electrolytes is impaired, and a rapid reintroduction of nutrition can lead to a severe shift of electrolytes and fluid balance. These shifts can cause dangerous complications such as hypophosphatemia (abnormally low blood phosphate levels), hypokalemia (abnormally decreased blood levels of potassium), and low levels of magnesium (hypomagnesemia), particularly during phases such as recovery from diabetic coma, in rickets, or during the growth hormone treatment.