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

Thyroid Disorders Message Board
Post New Thread   Closed Thread
LinkBack Thread Tools Search this Thread
Old 02-23-2008, 06:16 AM   #1
Senior Veteran
Join Date: Jan 2008
Location: Virginia
Posts: 667
Liz1900 HB User
Thyroid Blood Testing


Could someone explain the thyroid blood tests to me so that when I talk to my doctor, I will sound like I understand this?

Exactly what is the TSH testing?

What is free T3 and free T4?

My doctor only tests for TSH, but told me he could check the others, probably because I am having symptoms even after 3 changes in lowering my Armour.


Sponsors Lightbulb
Old 02-23-2008, 01:26 PM   #2
Senior Veteran
Join Date: Aug 2006
Location: Oak Ridge
Posts: 6,748
mkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB Usermkgbrook HB User
Re: Thyroid Blood Testing

The thyroid gland is one of several glands that make up the endocrine system. The glands of the endocrine system produce hormones that regulate the body's growth, metabolism, and sexual development and function.

Basic thyroid facts and information:
Specifically, the thyroid gland is a small, butterfly-shaped gland found just below the Adam's apple at the base of the neck, and in front of the trachea. The hormones produced by the thyroid gland are called T4 (thyroxine) and T3 (triiodothyronine) hormones. What do they do? Well they "control the rate at which every part of your body works (American College of Obstetricians and Gynecologists, 1999)" (i.e. your metabolism), as well as your body temperature, muscle tone and vigor, and growth hormone secretions -- essentially influencing every organ, tissue, and cell in the body. Your thyroid is your body;s overseerer.. when it no longer functions thing get out of line quickly. Free T3 and T4 measure the active levels of T3 and T4 in your blood stream. These tests are not subject to pregnancy hormones, BCs, meno treatments, diet, medications, or supplements. There is only a 2.5-5% error in this test. Total T3 and T4 measure actual T3 and T4 levels indirectly. They have a larger source of error and are subject to hormonal supplements, medications, diet.. etc.

The thyroid gland is controlled by a gland in the brain known as the pituitary. The pituitary gland makes thyroid-stimulating hormone (THS). THS stimulates the thyroid gland to make more hormone if needed (American College of Obstetricians and Gynecologists, 1999). If you have a problem with the pituitary gland or are producing specific hormones that interfere with the Pituitary glands receptors you can be secondary hypothyroid. This is where the TSH stays low when it should rise to reflect need for more thyroid hormone.

You should also get the TPOAb and TGAb tests run. These test for Hashimoto's Thyroiditis. The TPOAb is 90-95% positive identifier of Hashi's.

Good luck.
If we learn by our mistakes, I am working on one hell of an education.

Closed Thread

Similar Threads
Thread Thread Starter Board Replies Last Post
Thyroid Antibodies/Normal TSH,T3,T4 herekittykitty Thyroid Disorders 30 03-18-2010 09:50 AM
Relationship affected by wife's thyroid disorder Dreadlocked Thyroid Disorders 58 04-15-2009 07:10 AM
Thyroid Care and Concerns – Endocrine Balance Issues mkgbrook Thyroid Disorders 20 12-03-2008 12:19 PM
Recent thyroid labs - thyroid problem, or no? namelessme Thyroid Disorders 4 10-28-2008 12:41 PM
thyroid problem? cdg829 Thyroid Disorders 1 09-21-2008 05:47 PM
Thyroid Care and Concerns Around the World - Week 6! mkgbrook Thyroid Disorders 37 05-26-2008 10:41 PM
thyroid peroxidase and miscarriage fruitloop1024 Thyroid Disorders 14 03-27-2008 11:06 PM
thyroid and birth defects storm12 Thyroid Disorders 3 02-16-2008 09:11 PM
Thyroid Adrenal connection christinev Thyroid Disorders 11 07-12-2006 11:02 AM
hair loss with dhea, hydrocortisone and armour thyroid? binks Hair Loss / Alopecia 16 01-04-2005 05:01 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 01:40 AM.

Site owned and operated by™
Terms of Use © 1998-2015™ All rights reserved.
Do not copy or redistribute in any form!