Measurement of total plasma T3 is a sensitive test for hyperthyroidism since levels are usually raised proportionately more than total T4. In T3 thyrotoxicosis, total T3 is elevated but total and free T4 are normal. Please note that free T3 has replaced total T3 as the routinely used test at LTHT.
Tube
01 (SE) – Serum Gel
ID
Tests&Tubes0124
Turn around
A&E: N/A
Day Case: N/A
In-Patient: 24 Hours
Out-Patient: 24 Hours
GP: 72 Hours
Additional Information
*** NOT ROUTINELY AVAILABLE***
Send to
Blood Sciences LGI (for attention of referrals team, sample will not be processed in-house at Leeds)
Contact
For further details please contact Leeds Pathology customer services: [email protected].
Advice
This test is no longer widely used in the UK. Please bring any samples to the attention of the duty biochemist.
Collection Con
Minimum volume – 250µl serum / plasma Instructions for Lab Staff: Standard lab processing- No special requirements
Sample REQ
Blood
Ref. Range Notes
Blood Sciences reference ranges are available through the useful information and links page: Blood Sciences – Leeds Teaching Hospitals NHS Trust (leedsth.nhs.uk)
Units
nmol/L