Central Hypothyroidism, a Novel Laboratory Measurement


Medical management of central hypothyroidism is controversial due to lack of reference for evaluation of pituitary negative feedback. Therefore, titration of medical treatment is based on T4 levels, measured with variable laboratory methods. Patients who have central hypothyroidism usually have concomitant deficiencies in other pituitary hormones for which they need replacement therapy such as steroids, testosterone and growth hormone. This combined hormone deficiency makes clinical and laboratory evaluation challenging among these patients. Symptomatically, central hypothyroidism is relatively mild and lack non-specific and it might be overlooked due to other hormonal deficiencies. Replacement therapy for central hypothyroidism is titrated by arbitrary target free T4 levels of above 50th percentile of normal. The goal of our study is to compare the standard results from well known measure methods to a new method for measuring Ft4 using Liquid chromatography – tandem mass spectrometry.

Full Title of Study: “Central Hypothyroidism,a New Laboratory Approach for Hormone Measurement”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: N/A
    • Intervention Model: Single Group Assignment
    • Primary Purpose: Diagnostic
    • Masking: None (Open Label)
  • Study Primary Completion Date: February 2013


  • Drug: Eltroxin
    • Eltroxin dosage titration according to free T4 measurement every 3 months

Clinical Trial Outcome Measures

Primary Measures

  • free T4 levels
    • Time Frame: a year

Secondary Measures

  • Symptoms of hypothyroidism
    • Time Frame: a year

Participating in This Clinical Trial

Inclusion Criteria

  • Clinical evidence of central hypothyroidism: status post pituitary surgery and/or radiotherapy plus laboratory documentation of central hypothyroidism, with or without concurrent hormonal deficiencies in other axes, such as ACTH, LH, FSH

Exclusion Criteria

  • Primary hypothyroidism

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 90 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Sheba Medical Center
  • Provider of Information About this Clinical Study
    • Ruth Percik M.D., Sheba Medical Center
  • Overall Official(s)
    • Ruth Percik, M.D., Principal Investigator, Sheba Medical Center

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