The prevalence and causes of low serum thyrotropin concentration were studied in 886 individuals at age 85 years (601 women and 285 men). All participants were subject to detailed clinical and biochemical evaluation, including determination of serum thyrotropin and free thyroxine concentrations by chemiluminometric assays. Samples with thyrotropin concentrations below 0.20 mU/L or above 6.0 mU/L and/or free thryoxine concentrations above 22.0 pmol/L were selected for further assays. These selected individuals were followed-up during 3 years. Of 18 individuals without thyroid hormone treatment who had thyrotropin concentrations less than 0.20 pmol/L (13 below 0.10 pmol/L), only two were proved to be hyperthyroid; in another three, hyperthyroidism could not be excluded. The results indicate that most elderly individuals with low serum thyrotropin concentrations are not hyperthyroid and that abnormal thyroxine-binding globulin (in conjunction with drug treatment or nonthyroidal illness) is not a common cause of low thyrotropin concentration.
(Arch Intern Med. 1991;151:549-556)
Thank you for submitting a comment on this article. It will be reviewed by JAMA Internal Medicine editors. You will be notified when your comment has been published. Comments should not exceed 500 words of text and 10 references.
Do not submit personal medical questions or information that could identify a specific patient, questions about a particular case, or general inquiries to an author. Only content that has not been published, posted, or submitted elsewhere should be submitted. By submitting this Comment, you and any coauthors transfer copyright to the journal if your Comment is posted.
* = Required Field
Disclosure of Any Conflicts of Interest*
Indicate all relevant conflicts of interest of each author below, including all relevant financial interests, activities, and relationships within the past 3 years including, but not limited to, employment, affiliation, grants or funding, consultancies, honoraria or payment, speakers’ bureaus, stock ownership or options, expert testimony, royalties, donation of medical equipment, or patents planned, pending, or issued. If all authors have none, check "No potential conflicts or relevant financial interests" in the box below. Please also indicate any funding received in support of this work. The information will be posted with your response.
Some tools below are only available to our subscribers or users with an online account.
Download citation file:
Web of Science® Times Cited: 34
Customize your page view by dragging & repositioning the boxes below.
More Listings atJAMACareerCenter.com >
Enter your username and email address. We'll send you a link to reset your password.
Enter your username and email address. We'll send instructions on how to reset your password to the email address we have on record.
Athens and Shibboleth are access management services that provide single sign-on to protected resources. They replace the multiple user names and passwords necessary to access subscription-based content with a single user name and password that can be entered once per session. It operates independently of a user's location or IP address. If your institution uses Athens or Shibboleth authentication, please contact your site administrator to receive your user name and password.