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What is the normal thyroid range while on Synthroid?

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Posted on Fri, 30 Apr 2021
Question: I have been on Synthroid for about 15 years. I am taking 150mcg. What is the normal range for your thyroid numbers and what do they mean when it is high.
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Answered by Dr. Mirjeta Guni (1 hour later)
Brief Answer:
About levothyroxine dose;

Detailed Answer:
Hello and thank you for asking
The normal range of TSH is 0.4-4.2.
A TSH higher than normal means that the dose of levothyroxine is low or you do not take it appropriately (fasting in the morning and for 1 hour nothing to eat or drink).
If you have been taking it correctly and TSh is still high, your physician will increase the dose depending on TSh.
Hope i have been helpful.
Kind regards,
Dr.Mirjeta
Above answer was peer-reviewed by : Dr. Nagamani Ng
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Answered by
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Dr. Mirjeta Guni

Endocrinologist

Practicing since :2006

Answered : 2411 Questions

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What is the normal thyroid range while on Synthroid?

Brief Answer: About levothyroxine dose; Detailed Answer: Hello and thank you for asking The normal range of TSH is 0.4-4.2. A TSH higher than normal means that the dose of levothyroxine is low or you do not take it appropriately (fasting in the morning and for 1 hour nothing to eat or drink). If you have been taking it correctly and TSh is still high, your physician will increase the dose depending on TSh. Hope i have been helpful. Kind regards, Dr.Mirjeta