A 42-year-old woman is found to have a TSH of 18 mU/L (elevated) and a low free T4 on repeat testing. She complains of tiredness, weight gain and constipation. There is no pregnancy. What is the most appropriate management?AReassure that no treatment is required as this is subclinical hypothyroidismBStart lifelong Levothyroxine replacement and monitor TSHCStart CarbimazoleDStart Propranolol aloneERefer urgently on a suspected cancer pathwayCheck my answer