Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
170 Doctors are Online

Why is a repeat T4 and TSH test required in case results of prior test are elevated ?

User rating for this question
Very Good
Answered by

ENT Specialist
Practicing since : 2008
Answered : 662 Questions
I have an elevated (suppressed tsh) result and have been sent for another FT4 & tsh what are they looking for?
Posted Sun, 22 Apr 2012 in Thyroid Problem and Hormonal Problems
Answered by Dr. Puneet Maheshwari 6 hours later

Thanks for the query.

First of all, i will tell you about the normal physiology of thyroid gland.the thyroid gland produces T4 and T3. But this production is not possible without stimulation from the pituitary gland (TSH) which in turn is also regulated by the hypothalamus's TSH Releasing Hormone.

Now-the level of T3,T4,TSH is measured by Radio immuno assay.and T4 by RIA (radioimmunoassay) is the most used thyroid test of all.
There may be two possibilities--

1- INCREASED TSH-- it indicates hypothyroidism.
2- DECREASED- it indicates hyperthyroidism.

To test the thyroid functions, fasting is necessary, and it should be at-least overnight.

Thats why, your doctor advised you for FT4 and TSH. to get the more precise value.

IT is not a separate test.

Hope this information will help you. AND IN FUTURE , I M READY FOR FOLLOW UP.

Above answer was peer-reviewed by
Share on Facebook
Share on Twitter
Share on Google+
Question is related to
Diseases and Conditions
Medical Topics

The user accepted the expert's answer

Ask an Endocrinologist

© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor