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Triiodothyronine (Total T3) Concentration

Diagnostic test reference page from the Everyone Healthy database.

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Connected diagnostic information

Explore this test as a linked health pathway

1. What this test measures 2. Reference ranges 3. Increased / decreased markers 4. Related disease pages 5. Full article

What this test measures

This section shows the biological marker/agent measured by this diagnostic test. Each marker/agent opens its own page with related conditions. Detailed reference ranges are shown separately in the Reference ranges and concentrations section below, so they are not repeated here.

Reference ranges and concentrations

These ranges are pulled from the existing EH diagnostic-test reference range tables. They can vary by laboratory, method, age, sex, sample type and clinical situation.

Biological marker/agent / concentration	Reference range	Unit	Age	Gender	Category / test group
Triiodothyronine (Total T3)	1.1 – 2.43	ng/mL	Infant (0 - 1y)	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	1 – 2.1	ng/mL	Adult ( > 16y)	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	0.85 – 2.15	ng/mL	16y - 18y	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	0.5 – 1.9	ng/mL	Adult (> 65y)	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	0.95 – 2.45	ng/mL	Child (5 - 12y)	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	1.1 – 2.75	ng/mL	Child ( < 5y)	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	0.85 – 2.2	ng/mL	Child (13 - 15y)	Both	Blood Studies / Thyroid Functions Test
Triiodothyronine (Total T3)	1 – 7.5	ng/mL	< 5 days	Both	Blood Studies / Thyroid Functions Test

Tip: scroll sideways on small screens to see all columns. Ranges are educational only and must be interpreted by a qualified clinician.

Conditions where linked markers may be increased or decreased

This section links the test's biological markers/agents to related conditions. It is a browsing guide, not a diagnosis.

Markers often increased in

Markers often decreased in