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What Causes Low TSH And T4 Levels?

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Posted on Thu, 29 Jan 2015
Twitter Thu, 29 Jan 2015 Answered on
Twitter Mon, 16 Feb 2015 Last reviewed on
Question : I do not have thyroid. On 75mcg levothyroxine. What does it mean when TSH and free T4 low and how do they treat it?
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Answered by Dr. Binu Parameswaran Pillai (45 minutes later)
Brief Answer:
Central hypothyroidism

Detailed Answer:
Good day
Noted your concern.
Low T4 and TSH is an indication of central hypothyroidism. If it is due to a true cental hypothyroidism, then you should adjust levothyroxine dose to keep FT4 in the upper range of normal
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Dr. Binu Parameswaran Pillai

Endocrinologist

Practicing since :2003

Answered : 1438 Questions

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What Causes Low TSH And T4 Levels?

Brief Answer: Central hypothyroidism Detailed Answer: Good day Noted your concern. Low T4 and TSH is an indication of central hypothyroidism. If it is due to a true cental hypothyroidism, then you should adjust levothyroxine dose to keep FT4 in the upper range of normal