BOF: 19
A 27-year-old female presents with a
history of passing large volumes of urine, excessive thirst and drinking
copious amounts of water.
On examination she does not look
dehydrated her blood pressure was 120/80 with no postural drop.
Investigations reveal
Urea 2.3 mmol/L
Sodium 128 mmol/L
Potassium 3.4 mmol/L
Glucose 5.1 mmol/L
Albumin 35 g/L
Plasma osmolality 265 mOsmol/kg
Urine osmolality 50 mOsmol/kg
In this patient which one of the
following would you arrange next?
a)
Glucose tolerance test
b)
Water deprivation test
c)
Short synacthen test
d)
MRI brain
e)
Overnight dexamethasone suppression test