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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Fluctuating TSH Levels Despite Having Synthroid?

I ve been taking synthroid for 23 years after having a thyroidectomy ( had thyroid cancer). My dr recently had blood work done on me. Within the last year and a half my t4 level has increased from 9.0 - 12.0 and my tsh increased from .9 to 2.0. Also my b12 has dropped from 247 to 193. I m tired all the time. Is it normal for levels to fluctuate ? Are b12 injections the answer for the b12 deficiency? Thank you
Tue, 13 Dec 2016
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Endocrinologist,  's  Response
Hello and welcome!
I read carefully your concern.
There are unknown factors that cause fluctuations in TSH levels.
During different periods the needs for synthroid (levothyroxine) can change.
That is why is recommended to check the TSH level every 6 months and adjust the dose according to the result.

Yes, B12 deficiency can be treated with B12 injections.

For a personalised comprehensive evaluation, treatment recommendations, or individual therapy, ask me at HealthCareMagic at this private link:
HCM Dr. Guni

Kind regards,
Dr.Mirjeta

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What Causes Fluctuating TSH Levels Despite Having Synthroid?

Hello and welcome! I read carefully your concern. There are unknown factors that cause fluctuations in TSH levels. During different periods the needs for synthroid (levothyroxine) can change. That is why is recommended to check the TSH level every 6 months and adjust the dose according to the result. Yes, B12 deficiency can be treated with B12 injections. For a personalised comprehensive evaluation, treatment recommendations, or individual therapy, ask me at HealthCareMagic at this private link: HCM Dr. Guni Kind regards, Dr.Mirjeta