26th May 2025

A 52-year-old woman presents with hypercalcaemia found on routine GP Bloods.

A 52-year-old woman presents with hypercalcaemia found on routine GP Bloods. She has a medical history of HTN and takes regular ramipril and colecalciferol 800 units.  Further investigations show:

Investigations:

24 hour urinary calcium:  36 umol/L (normal > 22umol/L)  

Serum PTH: 2.2 pmol/L (normal 1.6 – 6.9 pmol/L)

What is the most likely underlying diagnosis?

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