In a 45-year-old patient with obesity, elevated TSH and normal free T4, what is the best initial treatment?

In a 45-year-old patient with obesity, elevated TSH and normal free T4, what is the best initial treatment?

• A. Treat with levothyroxine only
• B. Do not treat because T4 is normal
• C. Treat with desiccated thyroid
• D. Levothyroxine plus Cytomel

Answer: (A)

Subclinical hypothyroidism is indicated by an elevated TSH with a normal free T4. In a middle‑aged adult, the best initial approach is levothyroxine alone, to normalize the TSH without introducing T3-containing or animal-derived thyroid preparations. Starting with a stable synthetic T4 regimen provides a predictable dose and reduces the risk of overtreatment that can come with desiccated thyroid or combination therapy. Begin with a low dose (often around 25–50 mcg daily) and recheck TSH in 6–8 weeks, adjusting in small increments based on response and tolerance. This approach targets the thyroid axis while allowing separate, ongoing weight management strategies.

Subclinical hypothyroidism is indicated by an elevated TSH with a normal free T4. In a middle‑aged adult, the best initial approach is levothyroxine alone, to normalize the TSH without introducing T3-containing or animal-derived thyroid preparations. Starting with a stable synthetic T4 regimen provides a predictable dose and reduces the risk of overtreatment that can come with desiccated thyroid or combination therapy. Begin with a low dose (often around 25–50 mcg daily) and recheck TSH in 6–8 weeks, adjusting in small increments based on response and tolerance. This approach targets the thyroid axis while allowing separate, ongoing weight management strategies.