A 9-month-old infant is admitted with diarrhea and deficient fluid volume. The nurse plans to assess this client’s vital signs frequently. What other action would provide the most important assessment information（）
A. Measuring the infant’s body weight.
B. Obtaining a stool specimen for analysis.
C. Obtaining a urine specimen for analysis.
D. Inspecting the infant’s posterior fontanel.
参考答案：A
解析：
Frequent assessment of weight provides important information about fluid balance and the infant’s response to fluid replacement. Results of stool or urine analyses may provide information, but they’re typically not available for at least 24 hours. The posterior fontanel usually closes between ages 6 and 8 weeks and therefore doesn’t reflect fluid balance in a 9-month-old infant.