Editing Hashimoto's thyroiditis (section)

==== Monitoring ====
Thyroid Stimulating Hormone (TSH) is the laboratory value of choice for monitoring response to treatment with levothyroxine.<ref name=":4a">{{Cite web |title=Hashimoto's Thyroiditis |url=https://www.thyroid.org/hashimotos-thyroiditis/ |url-status=live |archive-url=https://web.archive.org/web/20230923182829/http://www.thyroid.org/hashimotos-thyroiditis/ |archive-date=23 September 2023 |access-date=2023-01-23 |website=American Thyroid Association |language=en-US}}</ref> When treatment is first initiated, TSH levels may be monitored as often as a frequency of every 6–8 weeks.<ref name=":4a" /> Each time the dose is adjusted, TSH levels may be measured at that frequency until the correct dose is determined.<ref name=":4a" /> Once [[Drug titration|titrated]] to a proper dose, TSH levels will be monitored yearly.<ref name=":4a" /> The target level for TSH is the subject of debate, with factors like age, sex, individual needs and special circumstances such as pregnancy being considered.<ref name="Taylor-2024" /> Recent studies suggest that adjusting therapy based on thyroid hormone levels (T<sub>4</sub> and/or T<sub>3</sub>) may be important.<ref name=":6" />

Monitoring liothyronine treatment or combination treatment can be challenging.<ref name="Taylor-2024" /><ref name="McAninch-2019" /><ref name="Elsevier-2006">{{Citation |title=Thyroid hormones |date=2006-01-01 |pages=3409–3416 | veditors = Aronson JK |url=https://www.sciencedirect.com/science/article/abs/pii/B0444510052009773 |access-date=2024-12-05 |place=Amsterdam |publisher=Elsevier |doi=10.1016/B0-44-451005-2/00977-3 |isbn=978-0-444-51005-1 |encyclopedia=Meyler's Side Effects of Drugs: The International Encyclopedia of Adverse Drug Reactions and Interactions (Fifteenth Edition)|url-access=subscription }}</ref> Liothyronine can suppress TSH to a greater extent than levothyroxine.<ref>{{Cite journal | vauthors = Taylor P, Arooj A, Hanna S, Eligar V, Muhammad Z, Stedman M, Premawardhana L, Okosieme O, Heald A, Dayan C |date=2023-10-31 |title=Thyroid hormone profiles on non-standard thyroid hormone replacement |url=https://www.endocrine-abstracts.org/ea/0094/ea0094p128 |journal=Endocrine Abstracts |language=en |publisher=Bioscientifica |volume=94 |doi=10.1530/endoabs.94.P128|url-access=subscription }}</ref> Short-acting Liothyronine's short half-life can result in large fluctuations of free T<sub>3</sub><ref name="Elsevier-2006" /> over the course of 24 hours.<ref>{{cite journal | vauthors = Saravanan P, Siddique H, Simmons DJ, Greenwood R, Dayan CM | title = Twenty-four hour hormone profiles of TSH, Free T3 and free T4 in hypothyroid patients on combined T3/T4 therapy | journal = Experimental and Clinical Endocrinology & Diabetes | volume = 115 | issue = 4 | pages = 261–267 | date = April 2007 | pmid = 17479444 | doi = 10.1055/s-2007-973071 }}</ref>

Patients may have to adjust their dosage several times over the course of the disease. Endogenous thyroid hormone levels may fluctuate, particularly early in the disease.<ref>{{cite journal | vauthors = Dunne C, De Luca F | title = Long-Term Follow-Up of a Child with Autoimmune Thyroiditis and Recurrent Hyperthyroidism in the Absence of TSH Receptor Antibodies | journal = Case Reports in Endocrinology | volume = 2014 | issue = 1 | pages = 749576 | date = 2014 | pmid = 25114812 | pmc = 4119923 | doi = 10.1155/2014/749576 | doi-access = free }}</ref> Patients may sometimes develop hyperthyroidism, even after long-term treatment.<ref name="Ramos-Levi2023" /> This can be due to a number of factors including acute attacks of destructive [[thyrotoxicosis]] (autoimmune attacks on the thyroid resulting in rises in thyroid hormone levels as thyroid hormones leak out of the damaged tissues).<ref name="Dyrka-2024" /><ref name="Ramos-Levi2023" /> This is usually followed by hypothyroidism.<ref name="Ramos-Levi2023" />