Tuesday, October 12, 2010

CONSULT ROUNDS: Free water excretion

C = \frac{UV}{P}

Someone has a urine Osm of 90? Can you calculate the free water loss?

Total Volume of Urine = Clearance of Solute + Clearance of Water
So your Free water Clearance of Water = Total Volume of urine - Clearance of solute
So Free water Clearance = Total volume - ( uosm/sosm * total volume)

Something simple but often forgotten!

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