TriIodothyronine Total

Test Results & Interpretations

Overview of TriIodothyronine Total

Test Description

The Triiodothyronine test is performed to detect and diagnose disorders of the thyroid gland including hypothyroidism and to evaluate the effectiveness of the treatment.

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
• Anxiety
• Weakness
• 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 other than water for 8-12 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.

Provided By




Established in 1995, Lifecare is the country's premier full-service diagnostic center with laboratory, providing expertise in imaging and digital pathology services. Our integrated diagnostic services help doctors personalize patient care to optimally treat disease and maintain health and wellness. We are committed to providing only the highest level of testing quality and service and working with you to provide unique solutions to your most challenging needs. A highly skilled team of medical professionals including physicians, scientists, medical technologists, medical technicians, lab assistants, biologists, chemists, microbiologists, geneticists, and other specialists work collaboratively. The department receives specimens for testing from patients and collection centers and is a reference laboratory for other clinics and hospitals both nationally and internationally. Lifecare's mission is to support the local delivery of laboratory services through the provision of exceptional reference laboratory services and by providing support services that facilitate and augment community integration efforts. We ensure Quality control programs that exceed industry guidelines for every patient sample. Proactive internal quality control team consisting of pathologists and laboratory personnel ensuring consistency and accuracy of specimen processing and diagnosis Our staff recognizes that specimens are patients, not just accession numbers in our lab. They are dedicated to combining the newest technologies, expertise, and quality in every sample they process.

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