31 一位57歲婦女因尿崩症導致高血鈉，其血清鈉離子濃度為160 mEq/L（正常值140 mEq/L），假設目前身體總水量（total body water）為24公升且無淨鈉流失，估計其水分流失約為多少公升？

2.5 3 3.5 4

3.5

WHY GIVE MATH QUESTIONS?

WATER NOW 24 LITERS

NA NO LOSS

THUS 24 X 160 = TOTAL NA NOW. = 3840

TOTAL NA / X = 140

ASSUME X IS THE PREVIOUS BODY WATER

X= 3480/140 =27.43

27.43 - 24 = 3. 43

3.43 LITER WATER LOSS