Overview of TriIodothyronine Total
Why Get Tested
The test is performed when TSH levels are abnormal but with normal T4 levels. It is also done when hypothyroidism symptoms appear, including:
• Increase in heart rate
• Weight loss
• Sleeping difficulty
• Hand tremors
• Sensitivity to light and visual disturbances
• Puffiness around eyes, irritation, dryness, and bulging of eyes in some cases
- Do not eat or drink anything except water at least 9 to 12 hours before the test.
What Results of TriIodothyronine Total mean?
The normal ranges of T3 are:
Adults (more than 20yrs): 80-200 ng/dL
• 0-5 days: 73-288 ng/dL
• 6 days-2 months: 80-275 ng/dL
• 3-11 months: 86-265 ng/dL
• 1-5 years: 92-248 ng/dL
• 6-10 years: 93-231 ng/dL
• 11-19 years: 91-218 ng/dL
Greater values indicate hyperthyroidism, while lesser values indicate hypothyroidism.