Follow-up Schedule for Patients with Hashimoto's Thyroiditis After Starting Levothyroxine

Initial Monitoring Period (First 4-6 Months)

• The American College of Clinical Oncology recommends checking TSH and Free T4 levels 6-8 weeks after starting levothyroxine therapy to assess initial response and make dose adjustments as needed 1, 3
• Adjust dosage by 12.5 to 25 mcg increments every 4-6 weeks until the patient is euthyroid and TSH is within the reference range 3
• Free T4 can be used to help interpret ongoing abnormal TSH levels during therapy, as TSH may take longer to normalize 1

Intermediate Follow-up (First Year)

• Once the appropriate maintenance dose is established and TSH normalizes, continue monitoring every 6-12 months 1, 3
• For patients who initially present with overt hypothyroidism, more frequent monitoring (every 3-6 months) during the first year may be beneficial 2
• Monitor for clinical improvement of symptoms alongside laboratory parameters 3

Long-term Monitoring

• After the first year with stable thyroid function, continue annual monitoring with TSH and clinical evaluation 1, 4
• Long-term monitoring is essential as some patients with Hashimoto's thyroiditis may experience changes in thyroid function over time, even after years of stability 4

Common Pitfalls to Avoid

• Failing to recheck thyroid function tests at the recommended 6-8 week interval after initiating therapy or changing dose 3
• Not considering medication interactions that can affect levothyroxine absorption 3