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Welcome to Just Answer and thanks for your question. It's impossible to say if you need replacement thyroid hormone without testing. It would depend on your levels of TSH and free T4 which they will continue to measure over time. With part of your thyroid left you may not need additional hormone. Not everyone does. It will depend on if you have cancer, and what treatment is given for it. If the remaining portion of your thyroid is destroyed with cancer treatment, eventually you will need replacement hormone. Thyroid hormone is required to live. However, at this point it isn't possible to say if you need it.
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