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Hi!

I'm just trying to understand what FA Q & A says about diabetes insipidus but it seems not working... (Q21, p345, chapter 13, Neurology, First aid Q and A for step 1, 3rd edition )

It's about the patient with obviously diabetes insipidus, if the urine gravity change is 1.002 --> 1.009 and the serum osmolality change is 300 --> 320 on (trial) subcutaneous vasopressin, what type of DI is it gonna be?

I'd really appreciate if anyone helped me out!
Thanks ;))
 

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This looks like a horrible response to me , so I 'd say nephro DI(ADH should conserve free H2O and reduce serum Osmolarity) .. But to be sure you must see the how the actual urine osmolarity responds after test Vasopressin administration . If it increases over 50% --> Central DI , No response --> Nephro DI
 
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