This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

T4 (serum total)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Plasma thyroxine ranges between 70-150 nomol per litre and may be measured by radioimmunoassay. It is a very good screening test for primary hypothyroidism where it is lowered. It is elevated in hyperthyroidism.


Related pages

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page