23rd May 2025

A 50-year-old female presents to her GP with fatigue, polyuria, polydipsia and nocturia.

A 50-year-old female presents to her GP with fatigue, polyuria, polydipsia and nocturia. She has a past medical history of bipolar disorder for which she takes lithium regularly. Water deprivation test suggests a diagnosis of diabetes insipidus. 

What results do you expect to see from a desmopressin stimulation test?

Select the SINGLE most appropriate option from the list below. Select ONE option only.