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Triiodothyronine (T3)

A triiodothyronine (T3) test measures the level of T3 in a sample of your blood. It's used to help diagnose thyroid disease.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

15 published ranges, each from a named source
20 y+
80–200 ng/dL
Ranges from ARUP Laboratories Test Directory, Mayo Clinic Laboratories (Pediatric Test Catalog).

All source ranges (15)
SourceSexAgeRange
ARUP Laboratories Test Directory All ≤ 3 d 96–292 ng/dL
ARUP Laboratories Test Directory All ≤ null d 14–86 ng/dL
ARUP Laboratories Test Directory All 4 d – 30 d 62–243 ng/dL
ARUP Laboratories Test Directory All 30 d – 2 y 81–281 ng/dL
ARUP Laboratories Test Directory All 2 y – 6 y 83–252 ng/dL
ARUP Laboratories Test Directory All 7 y – 11 y 92–219 ng/dL
ARUP Laboratories Test Directory All 12 y – 19 y 83–215 ng/dL
ARUP Laboratories Test Directory All 20 y+ 80–200 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All ≤ 5 d 73–288 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All 6 d – 2 mo 80–275 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All 3 mo – 11 mo 86–265 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All 1 y – 5 y 92–248 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All 6 y – 10 y 93–231 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All 11 y – 19 y 91–218 ng/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All 20 y+ 80–200 ng/dL

What an abnormal result can be associated with

A high result
Increased circulating free T3
A low result
Decreased circulating free T3
Associations from LOINC2HPO (Human Phenotype Ontology). This is reference information, not a diagnosis: only a clinician can interpret your result in context.
details
Sample
Serum or plasma · LOINC
Listed under
Hyperthyroidism · Hypothyroidism · Thyroid Diseases
Code
LOINC 3053-6 · ng/dL
Also known as
T-3, Total T3, Triiodothyronine, Triodothyrne, thyroid hormone
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