25th August 2020

A 28-year-old woman presents to her GP after trying to conceive for 2 years

A 28-year-old woman presents to her GP after trying to conceive for 2 years. She also complains of more frequent headaches. She also has a history of irregular periods, her last being 6 weeks ago. She has no known past medical history. Her GP does a series of tests, and the results are as follows:

Urine pregnancy test: Negative

Thyroid function test: 

• TSH 3.8 mU/L (range: 0.4 – 4.0 mU/L)
• Free T4 15 pmol/L (range 9-25 pmol/L) 

Prolactin: 12000 mU/L (range: <390 mU/L) 

What is the most likely diagnosis?

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