22nd December 2021

A 48-year-old woman undergoes blood tests and urinalysis as part of a routine check-up

A 48-year-old woman undergoes blood tests and urinalysis as part of a routine check-up. She is asymptomatic however her blood test reveals hyponatraemia with normal thyroid and adrenal function. Her only medical history is diabetes mellitus, which is well controlled by metformin. She has no significant medical history but did undergo a total abdominal hysterectomy 4 weeks ago. What is the most likely diagnosis?

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