Hi, I've been taking thyroxine for approximately 21 years, currently on 100mg having been reduced from 175mg to 150mg over the past 4-5 years. Asked for blood test last week as I have put on weight was feeling tired and cold. I've been on bp meds for quite a few years and was put on atrovastatin last year. Rang for results and receptionist told me it was all normal but I had to have liver part retested in 3 months. I was so sure I would have to have higher dose of thyroxine that I didn't ask why I had to have this done. Any ideas? Many thanks.