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Reference ranges for thyroid hormones, Total T3 and Free T3, vary by age.
Total T3 Reference Ranges:
* Children aged 1-5 years: 106-203 nanograms per deciliter (ng/dL)
* Children aged 6-10 years: 104-183 ng/dL
* Children aged 11-14 years: 68-186 ng/dL
* Adolescents aged 15-17 years: 71-175 ng/dL
* Adults aged 18-99 years: 79-165 ng/dL
Free T3 Reference Ranges:
* Neonates (3 days old): 1.4-5.4 picograms per milliliter (pg/mL)
* Infants (4-30 days old): 2.0-5.2 pg/mL
* Ages 1 month to 1 year: 1.5-6.4 pg/mL
* Ages 1-6 years: 2.0-6.0 pg/mL
* Ages 7-11 years: 2.7-5.2 pg/mL
* Ages 12-17 years: 2.3-5.0 pg/mL
* Adults aged 18-99 years: 2.3-4.1 pg/mL
The Free T3 test plays an important role in determining the structure and function of thyroid hormones in the body, particularly in the diagnosis of hyperthyroidism. For adults (18-99 years), the accepted reference range for Free T3 is 2.3-4.1 pg/mL. Values falling below or above this range may indicate a thyroid hormone imbalance or abnormal thyroid activity.
What should Free T3 and Normal T3 levels be?
Total T3 Reference Ranges:
* Children aged 1-5 years: 106-203 nanograms per deciliter (ng/dL)
* Children aged 6-10 years: 104-183 ng/dL
* Children aged 11-14 years: 68-186 ng/dL
* Adolescents aged 15-17 years: 71-175 ng/dL
* Adults aged 18-99 years: 79-165 ng/dL
Free T3 Reference Ranges:
* Neonates (3 days old): 1.4-5.4 picograms per milliliter (pg/mL)
* Infants (4-30 days old): 2.0-5.2 pg/mL
* Ages 1 month to 1 year: 1.5-6.4 pg/mL
* Ages 1-6 years: 2.0-6.0 pg/mL
* Ages 7-11 years: 2.7-5.2 pg/mL
* Ages 12-17 years: 2.3-5.0 pg/mL
* Adults aged 18-99 years: 2.3-4.1 pg/mL
The Free T3 test plays an important role in determining the structure and function of thyroid hormones in the body, particularly in the diagnosis of hyperthyroidism. For adults (18-99 years), the accepted reference range for Free T3 is 2.3-4.1 pg/mL. Values falling below or above this range may indicate a thyroid hormone imbalance or abnormal thyroid activity.