27th February 2025

A 26-year-old man presents complaining of tiredness.

A 26-year-old man presents complaining of tiredness. His mother has hypothyroidism, so he requests blood tests for this. The blood results show no abnormality in thyroid function but a vitamin D level of 23 nmol/L (highly likely to be deficient if <25 nmol/L). 

His calcium levels are at the lower end of normal, but he has a normal phosphate and parathyroid hormone level. 

How should this patient be managed?

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