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How quickly can a blood test show changes in tsh?

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Dr. Robert Lang
Internal Medicine - Endocrinology

In brief: Depends on med

It depends on which type of medication, those containing T3 (liothyronine) will change the TSH quite rapidly whilet4 will take longer. Either way we usually wait at least a month to retest so that the result is stabilized to the current dose.
Tsh changes in those not on medication will depend on the medical condition, if any, that is present.

In brief: Depends on med

It depends on which type of medication, those containing T3 (liothyronine) will change the TSH quite rapidly whilet4 will take longer. Either way we usually wait at least a month to retest so that the result is stabilized to the current dose.
Tsh changes in those not on medication will depend on the medical condition, if any, that is present.
Dr. Robert Lang
Dr. Robert Lang
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