Skip to content
Trusted to do 100,000+ tests and consultations per month.
Trusted to do 100,000+ tests and consultations per month.

NOTES FROM THE LAB

Hello! My name is Jamila Quaye and I am a senior biomedical scientist with a specialism in haematology, here at One Day Tests laboratory.

Triiodothyronine (T3) - description and reference ranges

What is it?

Triiodothyronine (T3) is one of two main hormones that is produced by your thyroid. The other hormone is called Thyroxine (T4). Both T3 and T4 work to regulate your metabolism and affect your weight, temperature and nervous system, among others.

T3, T4 and TSH results are frequently used together for the diagnostics of thyroid problems.

Reference ranges

If your indicative T3 level is lower than the reference range for our laboratory:

Low T3 levels may mean you have hypothyroidism, a condition in which your body does not produce enough T3.

You should discuss this result with your GP.

If your indicative T3 level is higher than the reference range for our laboratory:

If your results show high T3 levels, it may mean you have a thyroid condition.

You should discuss this result with your GP.

Thyroid Function Blood Test

 


THYROID FUNCTION BLOOD TEST

£43.00
£43.00 - £43.00
£43.00
£49.00
£49.00 - £49.00
£49.00
Save 12% Save 12%
View full details

A perfect test for symptoms such as weight gain, fatigue, or hair loss, as well as a family history of thyroid disorders.

QUICK TEST FINDER

Find what you need in under 30 seconds with our (very clever!) test finder.

We offer a huge range of markers all a few clicks away, as well as fastest turnaround times.

FIND YOUR TEST
QUICK TEST FINDER

YOU MAY ALSO LIKE TO READ

  • doctor holding blood sample
    Dr. Adam Staten

    CAN A BLOOD TEST DETECT BONE PROBLEMS?

    A blood test can provide valuable insight into your bone health by measuring the minerals, enzymes, and proteins involved in bone formation and turnover. While blood tests cannot look directly at the bones, they can reveal biochemical changes that often appear when bones are weakened, breaking down faster than expected, or affected by underlying medical conditions.
    Read now
  • doctor with blood test sample
    Dr. Adam Staten

    WHAT DOES A BONE PROFILE TEST FOR?

    A bone profile blood test is a simple way to understand how well your bones are functioning and of knowing your blood levels of the minerals that are important for bone health. It measures key markers that play a role in bone strength, calcium balance, and overall skeletal health. Doctors often use this test when investigating symptoms such as bone pain, fatigue, or unexplained fractures, or when checking for conditions related to calcium and phosphate levels.
    Read now
  • doctor holding hcg test sample
    Dr. Adam Staten

    WHAT IS NORMAL HCG AT 5 WEEKS?

    Human chorionic gonadotropin, also known as hCG, is the hormone measured during pregnancy testing. Levels rise quickly during the early weeks and can provide useful information about how early pregnancy is developing. If you are around five weeks pregnant, understanding what is considered a normal hCG level can help you interpret your results with clarity and reassurance.
    Read now
See more