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Free T3 (Triiodothyronine)
Hormones
Free T3 (Triiodothyronine)
COMMON RANGE
2 – 4.4
pg/mL
1.76
4.64
M
Mayo Clinic Laboratories
Adult
↗
See all sources ↓
CONVERT & COMPARE
pg/mL
=
4.92
pmol/L
Reference ranges across 10+ sources
Adult reference ranges from 5 entries across 5 trusted sources, shown in pg/mL. Compare side-by-side.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
A
ARUP Laboratories
All
≥18
2 – 4.4 pg/mL
↗
M
Mayo Clinic Laboratories
All
≥18
2 – 4.4 pg/mL
↗
Q
Quest Diagnostics
All
≥18
2 – 4.4 pg/mL
↗
L
Labcorp
All
≥18
2 – 4.4 pg/mL
↗
R
RCPA / AACB Australasian Harmonised Reference Intervals
All
≥18
2.3 – 4.2 pg/mL
↗
A
ARUP Laboratories
All · ≥18
↗
2 – 4.4 pg/mL
M
Mayo Clinic Laboratories
All · ≥18
↗
2 – 4.4 pg/mL
Q
Quest Diagnostics
All · ≥18
↗
2 – 4.4 pg/mL
L
Labcorp
All · ≥18
↗
2 – 4.4 pg/mL
R
RCPA / AACB Australasian Harmonised Reference Intervals
All · ≥18
↗
2.3 – 4.2 pg/mL
Related biomarkers
Often tested alongside free t3 (triiodothyronine) or part of the same panel.
Thyroid Stimulating Hormone (TSH)
Hormones
Free T4 (Thyroxine)
Hormones
Total T4 (Thyroxine)
Hormones
Total T3 (Triiodothyronine)
Hormones
Reverse T3 (rT3)
Hormones
Thyroid Peroxidase Antibodies (TPO)
Hormones
Sources
A
ARUP Laboratories
M
Mayo Clinic Laboratories
Q
Quest Diagnostics
L
Labcorp
R
RCPA / AACB Australasian Harmonised Reference Intervals
Last updated 2026-05-02
This page aggregates publicly available reference data and clinical information from Mayo Clinic Laboratories and other sources. For general wellness information only — not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.
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