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Old 08-19-2004, 10:25 PM   #1
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Meds that can alter ft4 test....

I just ran across this and thought it interesting....

Free T4, serum
Free T4 is the metabolically active fraction of the total T4 level (the other fraction is bound to plasma protein) and is the precursor of T3.

The T4 reflects the amount of thyroxine in the blood. If the patient does not take any type of thyroid medication, this test is usually a good measure of thyroid function.

A blood sample is taken and serum is separated within 48 hours. T4 is done by RIA (radioimmunoassay) is the most used thyroid test of all. Other methods used are fluorescent immunoassay and chemiluminescent immunoassay. A resin T3 uptake (RT3u) should be done to correct for certain medications such as birth control pills, other hormones, seizure medication, cardiac drugs, or even aspirin that may alter the routine T4 test.

Reference levels
Newborns: 2.6 - 6.3 ng/dL (SI: 33.5 - 81.3 pmol/L)
Adults: 0.8 - 2.7 ng/dL (10.3-35 pmol/L)

I didn't know that even aspirin can alter the outcome of t4 test.
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Last edited by LuvMyLilDoggie; 08-19-2004 at 10:26 PM.

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Old 08-19-2004, 11:01 PM   #2
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Re: Meds that can alter ft4 test....

Besides aspirin, I wonder if diabetes meds affect tests?

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