MRCP2-1270

A 28-year-old woman has been referred to the Endocrinology clinic after discovering she is pregnant. She was diagnosed with hypothyroidism two years ago and is currently stable on a dose of levothyroxine 75 mcg once daily. She has also been taking folic acid 400 mcg once daily for the past 6 months. Her last blood test taken 6 months ago showed a TSH level of 1.4 mU/l.

You decide to order a repeat TSH and free T4 measurement. What is the most appropriate next step?