Congenital Hypothyroidism

After a positive newborn-screen result, obtain confirmatory serum TSH and total or free T4 promptly and initiate levothyroxine immediately when congenital hypothyroidism is diagnosed. Rapid restoration of normal serum T4 is necessary to prevent adverse effects on intellectual development, linear growth, and maturation; levothyroxine treatment is generally lifelong in congenital hypothyroidism. accessdata fda+1accessdata fdaLEVO-T® (levothyroxine sodium) tablets, for oral useaccessdata fda214047Orig1s000 | FDA - accessdata.fda.gov

Use oral levothyroxine rather than an oral thyroid hormone product for myxedema coma; the levothyroxine tablet label specifically states that oral thyroid hormone products should not be used for myxedema coma. If adrenal insufficiency is present or suspected, give glucocorticoid replacement before levothyroxine because uncorrected adrenal insufficiency is a contraindication and thyroid hormone can precipitate acute adrenal crisis. nctr-crs fda+1nctr-crs fdaThese highlights do not include all the information needed to use LEVOTHYROXINE SODIUM TABLETS safely and effectively. See full prescribing information for LEVOTHYROXINE SODIUM TABLETS. <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> LEVOTHYROXINE SODIUM tablets, for oral use <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> Initial U.S. Approval: 2002accessdata fdaThis label may not be the latest approved by FDA. For current ...

During the first 2 weeks of therapy, monitor newborns for cardiac overload, arrhythmias, and aspiration associated with avid suckling. The treatment tradeoff is narrow: undertreatment risks impaired neurodevelopment and growth, whereas overtreatment in infancy is associated with craniosynostosis, accelerated bone age, and potentially adverse brain maturation. accessdata fda+3accessdata fdaLEVO-T® (levothyroxine sodium) tablets, for oral useaccessdata fda214047Orig1s000 | FDA - accessdata.fda.govdailymed nlm nihMylan Pharmaceuticals Inc. LEVOTHYROXINE SODIUM- levothyroxine sodium ...nctr-crs fda<content styleCode="bold">These highlights do not include all the information needed to use <content styleCode="bold">THYQUIDITY ^® </content>safely and effectively. <content styleCode="bold"> See full prescribing information for <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content>. </content> </content> <br/> <br/> <content styleCode="bold"> <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content> (levothyroxine sodium) oral solution </content> <br/> <content styleCode="bold">Initial U.S. Approval: 2000</content>

In primary congenital hypothyroidism, use serial serum TSH with total or free T4 to assess replacement adequacy. A persistently abnormal TSH or thyroid hormone concentration should trigger review of dose, administration, adherence, food exposure, and interacting medications before assuming an unusual biologic requirement. Persistent biochemical hypothyroidism despite an apparently adequate dose may reflect inadequate absorption, nonadherence, drug interactions, or a combination of these factors. dailymed nlm nihdailymed nlm nihlevothyroxine sodium tablet Mylan Pharmaceuticals Inc.

In secondary or tertiary hypothyroidism, TSH is not a reliable index of replacement adequacy. Titrate levothyroxine to clinical euthyroidism and a free T4 concentration in the upper half of the reference range, rather than escalating therapy in response to TSH alone. dailymed nlm nih+1dailymed nlm nihlevothyroxine sodium tablet Preferred Pharmaceuticals, Inc.nctr-crs fda<content styleCode="bold">These highlights do not include all the information needed to use <content styleCode="bold">THYQUIDITY ^® </content>safely and effectively. <content styleCode="bold"> See full prescribing information for <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content>. </content> </content> <br/> <br/> <content styleCode="bold"> <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content> (levothyroxine sodium) oral solution </content> <br/> <content styleCode="bold">Initial U.S. Approval: 2000</content>

Interpret TSH cautiously during early treatment of congenital hypothyroidism. Some infants can have a serum TSH above 20 mU/L despite a serum T4 in the upper half of the normal range; free or total T4 therefore remains necessary for early treatment assessment. accessdata fdaaccessdata fda21-342 Levothyroxine Sodium Medical Review Part 2

For congenital hypothyroidism, check serum TSH and total or free T4 at 2 and 4 weeks after starting levothyroxine, then 2 weeks after each dosage change. After stabilization, repeat testing every 3-12 months until growth is complete; abnormal values or poor adherence warrant more frequent assessment. nctr-crs fdanctr-crs fda<content styleCode="bold">These highlights do not include all the information needed to use <content styleCode="bold">THYQUIDITY ^® </content>safely and effectively. <content styleCode="bold"> See full prescribing information for <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content>. </content> </content> <br/> <br/> <content styleCode="bold"> <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content> (levothyroxine sodium) oral solution </content> <br/> <content styleCode="bold">Initial U.S. Approval: 2000</content>

Use the full age-based daily dose in most pediatric patients. Start below full replacement in newborns 0-3 months at risk for cardiac failure; similarly, lower initial dosing is appropriate in elderly patients, patients with cardiovascular disease, and patients with severe longstanding hypothyroidism because thyroid hormone can provoke cardiac adverse reactions including atrial fibrillation. accessdata fda+2accessdata fda214047Orig1s000 | FDA - accessdata.fda.govnctr-crs fdaThese highlights do not include all the information needed to use LEVOTHYROXINE SODIUM TABLETS safely and effectively. See full prescribing information for LEVOTHYROXINE SODIUM TABLETS. <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> LEVOTHYROXINE SODIUM tablets, for oral use <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> Initial U.S. Approval: 2002accessdata fdaThis label may not be the latest approved by FDA. For current ...

Account for changing requirements during growth and for factors that alter levothyroxine exposure, including food, concomitant medications, clinical comorbidity, and pregnancy in later life. Levothyroxine has a narrow therapeutic index, so dose changes should follow laboratory reassessment and clinical status rather than empiric escalation. dailymed nlm nih+2dailymed nlm nih[PDF] levothyroxine sodium tablet Preferred Pharmaceuticals Inc. - DailyMeddailymed nlm nihlevothyroxine sodium tablet Mylan Pharmaceuticals Inc.dailymed nlm nihMylan Pharmaceuticals Inc. LEVOTHYROXINE SODIUM- levothyroxine sodium ...

Prioritize thyroid dysgenesis when thyroid imaging shows aplasia, ectopia, or a dysgenetic gland. Thyroid aplasia or ectopic thyroid constitutes approximately 85% of congenital hypothyroidism, and ectopic thyroid development is the most frequent form of thyroid dysgenesis. NEJM+1NEJMCase 13-2021: A Newborn Girl with a Neck MassNEJMFamilial Forms of Thyroid Dysgenesis among Infants with ...

Consider dyshormonogenesis when congenital hypothyroidism occurs with a gland in situ and investigate a genetic biosynthetic defect when the clinical setting supports it. Congenital hypothyroidism can result from mutations in multiple genes involved in thyroid hormone biosynthesis, including inactivating mutations in thyroid oxidase 2. JAMA+1JAMAThyroid Disorders in Children and Adolescents: A ReviewNEJMInactivating Mutations in the Gene for Thyroid Oxidase 2 ...

Use thyroid gland imaging, TSH at diagnosis and during therapy, levothyroxine dose requirement, and need for dose escalation as predictors of transient versus permanent disease; these factors are associated with, but do not definitively establish, disease permanence. Higher diagnostic TSH concentrations are reported in thyroid dysgenesis than in infants with eutopic glands. Wiley+1WileyPermanent or Transient Congenital Hypothyroidism: A Diagnostic Dilemma - Dermitzaki - Acta Paediatrica - Wiley Online LibraryWileyPermanent or Transient Congenital Hypothyroidism: A Diagnostic Dilemma - Dermitzaki - 2026 - Acta Paediatrica - Wiley Online Library

In very premature or NICU infants with delayed TSH elevation, maintain concern for transient disease while ensuring replacement when indicated. In one cohort, 93% of children with delayed TSH elevation recovered spontaneously or after levothyroxine treatment, although permanent disease was identified during the first 6 months of life. WileyWileyThe natural history of congenital hypothyroidism with delayed TSH elevation in neonatal intensive care newborns - Zung - 2020 - Clinical Endocrinology - Wiley Online Library

A single newborn-screen result does not exclude later TSH elevation in preterm or low-birth-weight infants. Immaturity of the hypothalamic-pituitary-thyroid axis makes these infants disproportionately represented among false-negative results in TSH-based screening programs; serial screening is therefore relevant in this population. Wiley+1WileyThe natural history of congenital hypothyroidism with delayed TSH elevation in neonatal intensive care newborns - Zung - 2020 - Clinical Endocrinology - Wiley Online LibraryScienceDirectNeonatal screening for congenital hypothyroidism: Time to lower the TSH threshold in France - ScienceDirect

Screening strategy affects what is detected. Primary TSH screening and primary T4 with reflex TSH identify congenital hypothyroidism through different pathways, and U.S. programs have commonly used an initial dried-blood-spot total T4 followed by TSH testing in infants with low T4 values. ScienceDirectScienceDirectDiagnostic effectiveness of TSH screening and of T4 with secondary TSH screening for newborn congenital hypothyroidism - ScienceDirect

When an infant has delayed TSH elevation, use the same clinical priorities as for other suspected congenital hypothyroidism: obtain serum TSH and free or total T4, determine whether replacement is needed, and maintain longitudinal follow-up to distinguish recovery from permanent disease. Wiley+1WileyThe natural history of congenital hypothyroidism with delayed TSH elevation in neonatal intensive care newborns - Zung - 2020 - Clinical Endocrinology - Wiley Online Librarynctr-crs fda<content styleCode="bold">These highlights do not include all the information needed to use <content styleCode="bold">THYQUIDITY ^® </content>safely and effectively. <content styleCode="bold"> See full prescribing information for <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content>. </content> </content> <br/> <br/> <content styleCode="bold"> <content styleCode="bold"> <content styleCode="bold">THYQUIDITY ^® </content> </content> (levothyroxine sodium) oral solution </content> <br/> <content styleCode="bold">Initial U.S. Approval: 2000</content>