A 2-week-old infant (full-term at birth) is admitted to the pediatrics unit with "spitting up large amounts of formula" and diarrhea. The infant has developed a weak suck reflex
Which of the following statements about total body water (TBW) is accurate in this situation?
A) About 52% of the infants' weight accounts for the amount of water in their body.
B) Because of the infants' higher fat ratio, one should anticipate an increased TBW to as high as 90%.
C) Most full-term infants have a TBW of approximately 75% due to their high metabolic rate.
D) Most of an infant's TBW remains in the ICF compartment, so they should be able to transfer needed water into the ECF space.
Ans: C
Feedback:
Infants normally have more TBW than older children or adults. TBW constitutes approximately 75% to 80% of body weight in full-term infants and an even greater percentage in premature infants. In males, the TBW decreases in the elderly population to approximately 52% TBW. Obesity decreases TBW, with levels as low as 30% to 40% of body weight in adults. Infants have more than half of their TBW in their ECF compartment, as compared to adults.
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