My wife is 65 years old and she is taking thyronorm 100 mg for last 5 years & so long t3, t4 & tsh values were within limits. This month these parameters were tested and values are t3 - 89 ng/dl t4 - 12.51 ug/dl tsh - 0.08 uiu/ml please inform me why suddenly there is a change in value of t4 and what action is required.

Dr. Prabhakar Laxman JatharEndocrinologist48yrs exp

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Hello, Thanks for the query. The present values show that there is an extra dose of Levothyroxine. That is the reason for lower TSH (0.08 mU/L) & higher T4 levels. This means there's a need to reduce the Thyroxine dosage by 12.5 to 25 mcg per day. Then check TSH after 6 weeks. It should be ideally around 3 to 4 mU/L. Please tell me when was the last check made? Thanks. 

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