A patient has a body fluid of 300 mOsm/kg. This lab result is measuring:
a. osmolality.
b. osmolarity.
c. osmotic pressure.
d. oncotic pressure.
ANS: A
Osmolality measures the number of milliosmoles per kilogram of water, or the concentration of molecules per weight of water, while osmolarity measures the number of milliosmoles per liter of solution, or the concentration of molecules per volume of solution. Osmotic pressure is the amount of hydrostatic pressure required to oppose the osmotic movement of water. Oncotic pressure is from plasma proteins, not body fluids.
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