IV Fluids

Question 1

How do you divide up the TBW.

Answer 1

0.6 x mass = TBW

1/3 ECF

3/4ECF = interstitial
1/4 ECF = plasma
0.5 transcellu;ar

Question 2

Why do fluids with high Na+ stay more in the extracellular compartment?

Answer 2

Plasma also has a high Na+ concentration and therefore these fluids are isotonic with plasma.