Nephron Power: CONSULT ROUNDS: Free water excretion

$C = \frac{UV}{P}$

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

Yes!

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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