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.

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

  • woman taking blood
    Dr. Adam Staten

    IS HBA1C THE SAME AS INSULIN?

    HbA1c is a measure of your average blood glucose levels over the previous 8 to 12 weeks, while insulin is a hormone produced by the pancreas that helps move glucose from the bloodstream into cells.
    Read now
  • WHAT ARE THE 7 SIGNS OF INSULIN RESISTANCE?
    Dr. Adam Staten

    WHAT ARE THE 7 SIGNS OF INSULIN RESISTANCE?

    Insulin resistance is a common metabolic condition that often develops gradually over many years. In its early stages, it may cause few obvious symptoms, which is why many people do not realise they have it until blood tests reveal a problem.
    Read now
  • WHAT IS A NORMAL INSULIN LEVEL IN THE BLOOD?
    Dr. Adam Staten

    WHAT IS A NORMAL INSULIN LEVEL IN THE BLOOD?

    Insulin plays a vital role in regulating blood sugar levels and helping the body use glucose for energy. While many people are familiar with blood glucose testing, fewer understand what insulin levels can reveal about their metabolic health.
    Read now