Urine sodium 148
Urine potassium 48
Serum sodium 124
Urine output 2350
Electrolyte free water clearance:
-1364 mL
Interpretation: with those urine electrolytes, when urinates 2,300 mL it is as if he actually drank nearly a liter and a half of tap water. And that is why fluid restriction fails in dense SIADH.
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