Updated November 25, 2014.

Six years ago, the American Association of Clinical Endocrinologists recommended using a new thyroid TSH reference range of .3 to 3.0. Six years later, however, laboratories across the U.S. still use the older range of .5 to a top level of 4.5 to 6.0.
Endocrinologists' inability to agree is causing confusion and inadequate diagnosis and treatment for thyroid patients. Because while some doctors consider a TSH level above 3.0 as evidence of hypothyroidism, others refuse to acknowledge the new guidelines, and instead cling stubbornly to the older range.


And some general practice or family doctors, unaware of the controversy at all, simply review the lab reports, and base their decisions on whether the lab is flagging results as "high" or "low." And given that labs are still using the old range, that means many patients falling in the 3.0 to 5.0 range in treatment limbo.

Endocrine Today has two important new articles that address the TSH controversy, and they are must reading for all thyroid patients. I urge all thyroid patients to read these articles, so you can understand what is going on with your doctors about this issue.

• "Studies, data and dialogue needed to determine TSH range: The gold standard for thyroid dysfunction screening remains debatable", Endocrine Today
• "How should the TSH reference range be determined?"Endocrine Today

And here at About.com, I've been covering the TSH reference range controversy for years. You can read some of our key articles discussing the TSH test, and the reference range controversy here:

• Understanding the TSH Test

• Endocrinologists Say TSH Normal Range is Now 0.3 to 3: Millions More at Risk
• AACE Changes Position re: TSH Normal Range
• Does Your Doctor Know About the New TSH Lab Standards?
• The TSH Reference Range Wars: What's "Normal?", Who is Wrong, Who is Right...And What Does It All Mean For You and Your Health?

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