Central hypothyroidism

Measurement of serum free thyroxine (T4) levels should be performed 4 to 6 weeks after instituting a new levothyroxine dose. In general, serum free T4 should be checked yearly thereafter or when symptoms of thyroid hormone deficiency or excess arise.[3]Persani L, Brabant G, Dattani M, et al. 2018 European Thyroid Association (ETA) guidelines on the diagnosis and management of central hypothyroidism. Eur Thyroid J. 2018 Oct;7(5):225-37. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6198777 http://www.ncbi.nlm.nih.gov/pubmed/30374425?tool=bestpractice.com Additional monitoring should be tailored to the underlying etiology of central hypothyroidism.