Monday, September 25, 2017

SIADH vs Diabetes Insipidus, Osmolarity and Sodium levels in urine and serum in both (mnemonic)


Serum and urine findings in SIADH and  Diabetes Insipidus can really mess up our brains :S

A nice mnemonic to memorize SIADH is to recall the letters as  :
 "S"odium "I"s "A"lways "D"own "H"ere (by here: I mean serum) =>
so in SIADH:
=> low Na in serum
=> high Na in Urine & high Urine Osmolarity

Now ...just think of the opposite and you ll get Diabetes Insipidus
so in DI:
=> high Na in serum /high serum osmolarity
=> low Na in Urine

-Murad
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