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Hypothyroxinemia of prematurity

Last edited: 4/14/2026

Overview

Hypothyroxinemia of prematurity refers to low levels of thyroxine (T4) in preterm infants, often due to immature hypothalamic-pituitary-thyroid (HPT) axis function, which can impact growth, neurodevelopment, and overall health outcomes 71318.

Diagnosis

  • Clinical Presentation: Lethargy, poor feeding, weight loss, and developmental delays 7.
  • Recommended Tests: Serum thyroxine (T4) and thyroid-stimulating hormone (TSH) levels 718.
  • Grading: Typically defined by T4 levels below the reference range for gestational age 7.

    • Management

  • First-Line Treatments: Thyroxine supplementation, dose adjusted based on gestational age and clinical response 718.
  • Adjunctive Measures: Monitoring growth parameters and neurodevelopmental milestones regularly 713.
  • Vitamin D Supplementation: Consider enteral vitamin D supplementation to address deficiencies common in preterm infants 913.

    • Special Populations

  • Pediatrics: Preterm infants require close monitoring and individualized thyroxine dosing due to their unique HPT axis immaturity 718.
  • Comorbidities: Infants with additional morbidities (e.g., respiratory distress) may require tailored nutritional and developmental support 71221.

    • Key Recommendations

  • Screen for Thyroid Function Early: Routine screening of T4 and TSH levels in preterm infants shortly after birth to identify hypothyroxinemia 718 (Evidence: Strong).
  • Initiate Thyroxine Supplementation: Start thyroxine supplementation in infants with confirmed low T4 levels, adjusting doses based on gestational age and clinical response 718 (Evidence: Strong).
  • Monitor Growth and Development: Regular follow-up to assess growth parameters and neurodevelopmental outcomes, adjusting management as necessary 713 (Evidence: Moderate).

    • References

    1 Forrest CB, Koenigsberg LJ, Eddy Harvey F, Maltenfort MG, Halfon N. Trends in US Children's Mortality, Chronic Conditions, Obesity, Functional Status, and Symptoms. JAMA 2025. link 2 Marsubrin PMT, Ibrahim NAA, Dilmy MAF, Ariani Y, Wiweko B, Irwinda R et al.. Determinants of prematurity in urban Indonesia: a meta-analysis. Journal of perinatal medicine 2024. link 3 Silveira RC, Ting JY. Maternal-fetal-neonatal microbiome and outcomes associated with prematurity. BMC pediatrics 2024. link 4 Sha L, Shi X, Zhu M, Wang L, Dai X, Xiao G et al.. Implementation of STRONGkids for identifying nutritional risk in outpatients of child health care clinics: Results of a multicentre study. Clinical nutrition (Edinburgh, Scotland) 2023. link 5 Smith BM, Patel PP, Johnson SB, Bethell C. Racial and Ethnic Disparities in the Medical Home for Children Born Premature in the National Survey of Children's Health. Academic pediatrics 2023. link 6 O'Shea TM, McGrath M, Aschner JL, Lester B, Santos HP, Marsit C et al.. Environmental influences on child health outcomes: cohorts of individuals born very preterm. Pediatric research 2023. link 7 Baldassarre ME, Panza R, Cresi F, Salvatori G, Corvaglia L, Aceti A et al.. Complementary feeding in preterm infants: a position paper by Italian neonatal, paediatric and paediatric gastroenterology joint societies. Italian journal of pediatrics 2022. link 8 Thanhaeuser M, Eibensteiner F, Kornsteiner-Krenn M, Gsoellpointner M, Brandstetter S, Koeller U et al.. Preterm Infants on Early Solid Foods and Vitamin D Status in the First Year of Life-A Secondary Outcome Analysis of a Randomized Controlled Trial. Nutrients 2022. link 9 Kumar M, Shaikh S, Sinha B, Upadhyay RP, Choudhary TS, Chandola TR et al.. Enteral Vitamin D Supplementation in Preterm or Low Birth Weight Infants: A Systematic Review and Meta-analysis. Pediatrics 2022. link 10 Hendricks MR. How a Frightened Mother of a Preterm Newborn Eventually Flourished. Nursing for women's health 2021. link 11 Bangma JT, Kwiatkowski E, Psioda M, Santos HP, Hooper SR, Douglass L et al.. Assessing Positive Child Health among Individuals Born Extremely Preterm. The Journal of pediatrics 2018. link 12 van Veen S, Aarnoudse-Moens CSH, Oosterlaan J, van Sonderen L, de Haan TR, van Kaam AH et al.. Very preterm born children at early school age: Healthcare therapies and educational provisions. Early human development 2018. link 13 Salas AA, Woodfin T, Phillips V, Peralta-Carcelen M, Carlo WA, Ambalavanan N. Dose-Response Effects of Early Vitamin D Supplementation on Neurodevelopmental and Respiratory Outcomes of Extremely Preterm Infants at 2 Years of Age: A Randomized Trial. Neonatology 2018. link 14 Bassareo PP, Marras AR, Cugusi L, Zedda AM, Mercuro G. The reasons why cardiologists should consider prematurity at birth and intrauterine growth retardation among risk factors. Journal of cardiovascular medicine (Hagerstown, Md.) 2016. link 15 Boland RA, Davis PG, Dawson JA, Doyle LW. What are we telling the parents of extremely preterm babies?. The Australian & New Zealand journal of obstetrics & gynaecology 2016. link 16 Leal Mdo C, Esteves-Pereira AP, Nakamura-Pereira M, Torres JA, Domingues RM, Dias MA et al.. Provider-Initiated Late Preterm Births in Brazil: Differences between Public and Private Health Services. PloS one 2016. link 17 Nickel RS, Josephson CD. Neonatal Transfusion Medicine: Five Major Unanswered Research Questions for the Twenty-First Century. Clinics in perinatology 2015. link 18 Pinto K, Collins CT, Gibson RA, Andersen CC. Vitamin D in preterm infants: A prospective observational study. Journal of paediatrics and child health 2015. link 19 Vohr B. Speech and language outcomes of very preterm infants. Seminars in fetal & neonatal medicine 2014. link 20 Oncel MY, Calisici E, Ozdemir R, Yurttutan S, Erdeve O, Karahan S et al.. Is folic acid supplementation really necessary in preterm infants ≤ 32 weeks of gestation?. Journal of pediatric gastroenterology and nutrition 2014. link 21 McManus BM, Carle AC, Poehlmann J. Effectiveness of part C early intervention physical, occupational, and speech therapy services for preterm or low birth weight infants in Wisconsin, United States. Academic pediatrics 2012. link 22 Bertino E, Gilli G, Occhi L, Giuliani F, Di Nicola P, Spada E et al.. Postnatal growth of preterm infants: which reference charts?. Minerva pediatrica 2010. link 23 Kalia JL, Visintainer P, Brumberg HL, Pici M, Kase J. Comparison of enrollment in interventional therapies between late-preterm and very preterm infants at 12 months' corrected age. Pediatrics 2009. link 24 Rozé JC, Denizot S, Carbajal R, Ancel PY, Kaminski M, Arnaud C et al.. Prolonged sedation and/or analgesia and 5-year neurodevelopment outcome in very preterm infants: results from the EPIPAGE cohort. Archives of pediatrics & adolescent medicine 2008. link 25 Linder R. Integrating psychotherapy with obstetrics and gynaecology. Nutrition and health 2007. link 26 Stoelhorst GM, Rijken M, Martens SE, Brand R, den Ouden AL, Wit JM et al.. Changes in neonatology: comparison of two cohorts of very preterm infants (gestational age <32 weeks): the Project On Preterm and Small for Gestational Age Infants 1983 and the Leiden Follow-Up Project on Prematurity 1996-1997. Pediatrics 2005. link 27 Bellingham-Young DA, Adamson-Macedo EN. Prematurity and adult minor illness. Neuro endocrinology letters 2004. link 28 Robison NJ, Hodgman JE, Barton L, Pavlova Z. Causes of nursery death beyond the neonatal period. Journal of perinatology : official journal of the California Perinatal Association 2003. link 29 Goepfert AR, Goldenberg RL, Hauth JC, Bottoms SF, Iams JD, Mercer B et al.. Obstetrical determinants of neonatal neurological morbidity in < or = 1000-gram infants. American journal of perinatology 1999. link 30 . Capitated hospital cuts prematurity, saves big. Healthcare benchmarks 1998. link 31 Richardson DK, Gray JE, Gortmaker SL, Goldmann DA, Pursley DM, McCormick MC. Declining severity adjusted mortality: evidence of improving neonatal intensive care. Pediatrics 1998. link 32 Besinger RE. Preterm labor, premature rupture of membranes, and cervical incompetence. Current opinion in obstetrics & gynecology 1993. link 33 Brown D, Elkins TE. Ethical issues in obstetric cases involving prematurity. Clinics in perinatology 1992. link 34 Scheiner AP, Sexton ME, Rockwood J, Sullivan D, Davis H. The vulnerable child syndrome: fact and theory. Journal of developmental and behavioral pediatrics : JDBP 1985. link 35 Breart G, Goujard J, Blondel B, Maillard F, Chavigny C, Sureau C et al.. A comparison of two policies of ante-natal supervision for the prevention of prematurity. International journal of epidemiology 1981. link

    Original source

    1. [1]
      Trends in US Children's Mortality, Chronic Conditions, Obesity, Functional Status, and Symptoms. — Forrest CB, Koenigsberg LJ, Eddy Harvey F, Maltenfort MG, Halfon N JAMA (2025)
    2. [2]
      Determinants of prematurity in urban Indonesia: a meta-analysis. — Marsubrin PMT, Ibrahim NAA, Dilmy MAF, Ariani Y, Wiweko B, Irwinda R et al. Journal of perinatal medicine (2024)
    3. [3]
      Maternal-fetal-neonatal microbiome and outcomes associated with prematurity. — Silveira RC, Ting JY BMC pediatrics (2024)
    4. [4]
      Implementation of STRONGkids for identifying nutritional risk in outpatients of child health care clinics: Results of a multicentre study. — Sha L, Shi X, Zhu M, Wang L, Dai X, Xiao G et al. Clinical nutrition (Edinburgh, Scotland) (2023)
    5. [5]
      Racial and Ethnic Disparities in the Medical Home for Children Born Premature in the National Survey of Children's Health. — Smith BM, Patel PP, Johnson SB, Bethell C Academic pediatrics (2023)
    6. [6]
      Environmental influences on child health outcomes: cohorts of individuals born very preterm. — O'Shea TM, McGrath M, Aschner JL, Lester B, Santos HP, Marsit C et al. Pediatric research (2023)
    7. [7]
      Complementary feeding in preterm infants: a position paper by Italian neonatal, paediatric and paediatric gastroenterology joint societies. — Baldassarre ME, Panza R, Cresi F, Salvatori G, Corvaglia L, Aceti A et al. Italian journal of pediatrics (2022)
    8. [8]
      Preterm Infants on Early Solid Foods and Vitamin D Status in the First Year of Life-A Secondary Outcome Analysis of a Randomized Controlled Trial. — Thanhaeuser M, Eibensteiner F, Kornsteiner-Krenn M, Gsoellpointner M, Brandstetter S, Koeller U et al. Nutrients (2022)
    9. [9]
      Enteral Vitamin D Supplementation in Preterm or Low Birth Weight Infants: A Systematic Review and Meta-analysis. — Kumar M, Shaikh S, Sinha B, Upadhyay RP, Choudhary TS, Chandola TR et al. Pediatrics (2022)
    10. [10]
      How a Frightened Mother of a Preterm Newborn Eventually Flourished. — Hendricks MR Nursing for women's health (2021)
    11. [11]
      Assessing Positive Child Health among Individuals Born Extremely Preterm. — Bangma JT, Kwiatkowski E, Psioda M, Santos HP, Hooper SR, Douglass L et al. The Journal of pediatrics (2018)
    12. [12]
      Very preterm born children at early school age: Healthcare therapies and educational provisions. — van Veen S, Aarnoudse-Moens CSH, Oosterlaan J, van Sonderen L, de Haan TR, van Kaam AH et al. Early human development (2018)
    13. [13]
      Dose-Response Effects of Early Vitamin D Supplementation on Neurodevelopmental and Respiratory Outcomes of Extremely Preterm Infants at 2 Years of Age: A Randomized Trial. — Salas AA, Woodfin T, Phillips V, Peralta-Carcelen M, Carlo WA, Ambalavanan N Neonatology (2018)
    14. [14]
      The reasons why cardiologists should consider prematurity at birth and intrauterine growth retardation among risk factors. — Bassareo PP, Marras AR, Cugusi L, Zedda AM, Mercuro G Journal of cardiovascular medicine (Hagerstown, Md.) (2016)
    15. [15]
      What are we telling the parents of extremely preterm babies? — Boland RA, Davis PG, Dawson JA, Doyle LW The Australian & New Zealand journal of obstetrics & gynaecology (2016)
    16. [16]
      Provider-Initiated Late Preterm Births in Brazil: Differences between Public and Private Health Services. — Leal Mdo C, Esteves-Pereira AP, Nakamura-Pereira M, Torres JA, Domingues RM, Dias MA et al. PloS one (2016)
    17. [17]
      Neonatal Transfusion Medicine: Five Major Unanswered Research Questions for the Twenty-First Century. — Nickel RS, Josephson CD Clinics in perinatology (2015)
    18. [18]
      Vitamin D in preterm infants: A prospective observational study. — Pinto K, Collins CT, Gibson RA, Andersen CC Journal of paediatrics and child health (2015)
    19. [19]
      Speech and language outcomes of very preterm infants. — Vohr B Seminars in fetal & neonatal medicine (2014)
    20. [20]
      Is folic acid supplementation really necessary in preterm infants ≤ 32 weeks of gestation? — Oncel MY, Calisici E, Ozdemir R, Yurttutan S, Erdeve O, Karahan S et al. Journal of pediatric gastroenterology and nutrition (2014)
    21. [21]
      Effectiveness of part C early intervention physical, occupational, and speech therapy services for preterm or low birth weight infants in Wisconsin, United States. — McManus BM, Carle AC, Poehlmann J Academic pediatrics (2012)
    22. [22]
      Postnatal growth of preterm infants: which reference charts? — Bertino E, Gilli G, Occhi L, Giuliani F, Di Nicola P, Spada E et al. Minerva pediatrica (2010)
    23. [23]
      Comparison of enrollment in interventional therapies between late-preterm and very preterm infants at 12 months' corrected age. — Kalia JL, Visintainer P, Brumberg HL, Pici M, Kase J Pediatrics (2009)
    24. [24]
      Prolonged sedation and/or analgesia and 5-year neurodevelopment outcome in very preterm infants: results from the EPIPAGE cohort. — Rozé JC, Denizot S, Carbajal R, Ancel PY, Kaminski M, Arnaud C et al. Archives of pediatrics & adolescent medicine (2008)
    25. [25]
      Integrating psychotherapy with obstetrics and gynaecology. — Linder R Nutrition and health (2007)
    26. [26]
      Changes in neonatology: comparison of two cohorts of very preterm infants (gestational age <32 weeks): the Project On Preterm and Small for Gestational Age Infants 1983 and the Leiden Follow-Up Project on Prematurity 1996-1997. — Stoelhorst GM, Rijken M, Martens SE, Brand R, den Ouden AL, Wit JM et al. Pediatrics (2005)
    27. [27]
      Prematurity and adult minor illness. — Bellingham-Young DA, Adamson-Macedo EN Neuro endocrinology letters (2004)
    28. [28]
      Causes of nursery death beyond the neonatal period. — Robison NJ, Hodgman JE, Barton L, Pavlova Z Journal of perinatology : official journal of the California Perinatal Association (2003)
    29. [29]
      Obstetrical determinants of neonatal neurological morbidity in < or = 1000-gram infants. — Goepfert AR, Goldenberg RL, Hauth JC, Bottoms SF, Iams JD, Mercer B et al. American journal of perinatology (1999)
    30. [30]
      Capitated hospital cuts prematurity, saves big. Healthcare benchmarks (1998)
    31. [31]
      Declining severity adjusted mortality: evidence of improving neonatal intensive care. — Richardson DK, Gray JE, Gortmaker SL, Goldmann DA, Pursley DM, McCormick MC Pediatrics (1998)
    32. [32]
      Preterm labor, premature rupture of membranes, and cervical incompetence. — Besinger RE Current opinion in obstetrics & gynecology (1993)
    33. [33]
      Ethical issues in obstetric cases involving prematurity. — Brown D, Elkins TE Clinics in perinatology (1992)
    34. [34]
      The vulnerable child syndrome: fact and theory. — Scheiner AP, Sexton ME, Rockwood J, Sullivan D, Davis H Journal of developmental and behavioral pediatrics : JDBP (1985)
    35. [35]
      A comparison of two policies of ante-natal supervision for the prevention of prematurity. — Breart G, Goujard J, Blondel B, Maillard F, Chavigny C, Sureau C et al. International journal of epidemiology (1981)
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