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Should I take by meds when going to get bloodwork?
I am going to get bloodwork and was curious if I should or should not take my meds when going? ( I am pregnant also) Thank you!!!
Taking t4 meds before a blood draw will cause the free t4 level to be about 20% higher than it really is for several hours afterward.
The following is from thyroidmanager.org:
Measured levels of free and total T4 are influenced by the interval between tablet ingestion and blood sampling. In athyreotic subjects who took 0.15-0.2 mg T4 orally, the serum free and total T4 concentrations were increased by about 20% one to four hours later, with return to baseline about nine hours after T4 ingestion; serum TSH and T3 levels showed no time-dependent variation.
The TSH and free t3 are not affected.
The following is from thyroidmanager.org:
Measured levels of free and total T4 are influenced by the interval between tablet ingestion and blood sampling. In athyreotic subjects who took 0.15-0.2 mg T4 orally, the serum free and total T4 concentrations were increased by about 20% one to four hours later, with return to baseline about nine hours after T4 ingestion; serum TSH and T3 levels showed no time-dependent variation.
The TSH and free t3 are not affected.
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