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Hormones & Fertilitypmol/L

Free T3 (Triiodothyronine)

Free T3 is the biologically active thyroid hormone directly driving cellular energy expenditure, temperature, and heart rhythm.

Common laboratory aliases and abbreviations:FT3T3 libreTriiodothyronine libreFree T3Free triiodothyronineT3 libre sérica

Test your personal value

Enter the number from your lab report to instantly see how it compares to reference ranges.

pmol/L
5pmol/L
3.5
6.5
‹ LowRange: 3.5 – 6.5 pmol/LHigh ›

Physiological Reference Ranges

The ranges below represent standard adult physiological values. Your laboratory's printed reference range always takes precedence.

Adults (general)

3.5 – 6.5 pmol/L

Adult females

3.5 – 6.5 pmol/L

Adult males

3.5 – 6.5 pmol/L

Common alternative units:
pg/mL(×1.536 pmol/L)
ng/dL(×0.01536 pmol/L)

What does a low result mean?

A slightly low level can accompany calorie-restricted diets, winter sluggishness, or standard recovery from a seasonal virus.

What does a high result mean?

A mildly increased level can occur during brief thyroid stimulation or heightened energetic demands.

Questions ready for your doctor

Bring these questions to your next consultation to discuss with your healthcare practitioner:

  • Is my peripheral conversion from T4 to active T3 functioning smoothly?
  • Does this correlate consistently with my overall vitality?
  • Is a comprehensive thyroid panel appropriate going forward?

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Important information — Medical notice

ScanMyLab is for informational purposes only. It does not provide a diagnosis and never replaces the advice of your doctor or laboratory.