It appears you have not yet Signed Up with our community. To Sign Up for free, please click here....

Thyroid Disorders Message Board

Meds that can alter ft4 test....

Post New Thread   Closed Thread
LinkBack Thread Tools Search this Thread
Old 08-19-2004, 09:25 PM   #1
Senior Veteran
Join Date: Aug 2003
Location: USA
Posts: 3,441
LuvMyLilDoggie HB UserLuvMyLilDoggie HB UserLuvMyLilDoggie HB UserLuvMyLilDoggie HB User
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.
Live, Love, Laugh.

Last edited by LuvMyLilDoggie; 08-19-2004 at 09:26 PM.

Sponsors Lightbulb
Old 08-19-2004, 10:01 PM   #2
Senior Veteran
Join Date: Jan 2002
Posts: 1,053
Eagle HB UserEagle HB UserEagle HB User
Re: Meds that can alter ft4 test....

Besides aspirin, I wonder if diabetes meds affect tests?

Closed Thread

Similar Threads
Thread Thread Starter Board Replies Last Post
CONFUSED with THYROID readings?? I need help? meds do nto seem to be working? bluetou Thyroid Disorders 17 05-12-2011 07:18 PM
Pain Meds, When is too Much??? Stress2006 Pain Management 9 02-27-2009 02:47 PM
Do these numbers warrant meds? kingskid High Cholesterol 11 02-12-2008 11:25 AM
Non narcotic prescription pain meds Sunshinegirl Addiction & Recovery 11 07-24-2007 11:22 AM
Question about CT Scan and Iodine Dye and MEDS??? katkatdd Thyroid Disorders 3 06-02-2007 06:26 PM
My cholesterol lowering success story ChristianZane High Cholesterol 21 12-13-2005 05:43 PM
to take or not to take meds? Donnalynne Multiple Sclerosis 5 10-17-2005 07:06 AM
Birth control what meds ect. can mess up the the effectiveness ilvmyhsbnd Birth Control 3 07-29-2005 08:01 AM
How do oral contraceptives alter TSH results? Peeps Thyroid Disorders 6 01-26-2004 12:28 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Sign Up Today!

Ask our community of thousands of members your health questions, and learn from others experiences. Join the conversation!

I want my free account

All times are GMT -7. The time now is 10:25 PM.

Site owned and operated by HealthBoards.comô
© 1998-2018 HealthBoards.comô All rights reserved.
Do not copy or redistribute in any form!