A 56-year-old male presents with a
painful swollen left knee. There is no history of trauma.
He gives a history of pain and stiffness of both hands. He is impotent
and he has been investigated for abdominal pain in the past but no cause was
On examination his skin is
pigmented. There is tenderness and swelling of the 2nd and 3rd
metacarpophalangeal joints of both hands, his liver is enlarged 4
fingerbreadths. His knee is swollen and aspiration of the joint yields turbid,
straw coloured fluid.
In this patient which of the
following tests would identify the underlying condition?
Plasma growth hormone levels
Fasting blood sugar levels
Serum urate levels