A 67-year-old headteacher is commenced on 75mcg of levothyroxine once daily
A 67-year-old headteacher is commenced on 75mcg of levothyroxine once daily after blood tests revealed a raised TSH and low thyroid hormone levels. What is the single best initial test for monitoring response to therapy with levothyroxine in primary hypothyroidism?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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