thyroid hormone withdrawal
Deliberate discontinuation of thyroid hormone replacement to stimulate TSH production for enhanced radioiodine therapy or diagnostic testing.
Full Definition
Thyroid hormone withdrawal involves the temporary cessation of levothyroxine therapy for 4-6 weeks to allow endogenous TSH levels to rise above 30 mIU/L, thereby stimulating iodine uptake by thyroid tissue and thyroid cancer cells. This induced hypothyroid state enhances the efficacy of radioactive iodine therapy and improves the sensitivity of thyroglobulin measurements. While effective, this approach causes significant hypothyroid symptoms and has largely been replaced by recombinant human TSH (rhTSH) stimulation in many clinical scenarios.
Usage
Usage note: Document target TSH levels and timeline, as inadequate stimulation compromises treatment efficacy.
In Context
- "Thyroid hormone withdrawal was initiated six weeks prior to the planned radioiodine therapy session." — Treatment preparation protocol
- "The patient experienced significant fatigue and depression during thyroid hormone withdrawal but achieved adequate TSH elevation." — Clinical follow-up note