What this test is
Most triiodothyronine in blood is bound to carrier proteins and is present in smaller amounts than T4, so total T3 is not used alone for diagnosis but adds context when a doctor needs an overview.
Category: Thyroid Function
T3
Total T3 measures the active thyroid hormone, both protein-bound and free. Levels can shift with illness and several medicines.
What it is used for, and who should test
- Assessing hyperthyroidism when ordered with other thyroid tests
- Monitoring thyroid patients where free T3 testing has limitations
- Supporting interpretation when TSH and T4 results disagree
Sample and preparation
- Sample
- 2-3 mL of blood in a serum tube
- Preparation
- No fasting required. Mention acute illness or thyroid hormone medicines.
Where to get tested
Samples are collected and results issued at S.F. Laboratory, the in-house laboratory of BK5 Med Health Clinic in Don Hua Lo, Chon Buri. No appointment is needed; walk in during opening hours.
- Sample collection at BK5 Clinic, 149/6-7 Don Hua Lo, Chon Buri District, Chon Buri 20000
- Open Monday-Friday 08.30-20.00 and Saturday 08.30-17.00
- Ask questions or book ahead on LINE @824xsgsj or call 063-223-6161
The information on this page is general knowledge to support your decisions and is not personal medical advice. Interpreting results and planning treatment requires assessment by a doctor. Please consult our medical staff before deciding on testing or treatment.
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Thyroid Function
Frequently asked questions about this test
How does total T3 differ from free T3?
Total T3 counts both bound and unbound hormone, while free T3 measures only the active unbound fraction, which is more accurate for thyroid assessment.
Can illness affect T3?
Yes. Acute illness, surgery or fasting can lower T3 without any thyroid disease.
How should I prepare for T3?
No fasting required. Mention acute illness or thyroid hormone medicines.
How long do results take?
About 1 day, depending on the laboratory workload that day. Our staff will confirm the collection time when you are served.
Where can I have this test done?
Samples are collected and results issued at S.F. Laboratory, the in-house laboratory of BK5 Med Health Clinic in Don Hua Lo, Chon Buri. No appointment is needed; walk in during opening hours.
How much does T3 cost?
Prices are not shown on this website. Ask for pricing and packages on LINE @824xsgsj or call 063-223-6161.
Contact us
Book a visit or ask a question
Add us on LINE @824xsgsj to ask about tests and pricing, or fill in the form below and our team will get back to you as soon as possible.
Phone
063-223-6161LINE Official
@824xsgsj
Address
149/6-7 Don Hua Lo, Chon Buri District, Chon Buri 20000, Thailand
Get directions (Google Maps)Opening hours
- Monday - Friday
- 08.30 - 20.00
- Saturday
- 08.30 - 17.00