Mr Ahmed is 45 years old and presented recently to the GP with a three week history of irritability and weight loss. He is normally fit and well. Systems examination revealed a smooth, non-tender goitre. He has returned to discuss the results of the blood test that was taken. Apart from a regular pulse rate of 110bpm, the remainder of his observations are still within normal limits.

Blood results:

Hb 145 g/dl

WBC 7.3 x 109/L

Platelets 240 x 109/L

TSH < 0.05 mU/L T4 60 pmol/L Bone profile normal Urea and electrolytes unremarkable Liver function tests unremarkable Vitamin D normal What is the next most appropriate course of action to take today?