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Thyroid Disorders Message Board

Difference between FT4&F4.....

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Old 08-14-2003, 10:02 PM   #1
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Edda HB User
Post Difference between FT4&F4.....

Can someone please explain to me the difference between
I am going to a blood test tomorrow and they are gonna test my FT4, FT3 and TSH. Should they also check for F4 and F3 or is this enough???


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Old 08-14-2003, 11:31 PM   #2
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Edda HB User

sorry meant ofcourse
FT4 and T4
FT3 and T3

This is all very confusing

Old 08-15-2003, 07:23 AM   #3
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dea4 HB Userdea4 HB Userdea4 HB Userdea4 HB User

FT4 and FT3 or free T4 and free T3 are the active thyroid hormones in the blood that are available to your body and what your body is "running" on. T4 or total T4 is bound and free hormone, only the free hormone which is about 0.05% of total is biologically active, Total T3 is also bound and free hormone.

Old 08-15-2003, 12:59 PM   #4
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Edda HB User

Thank you for your reply dea4

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