T3 Total Thyroid Test
$ 89.99
T3 Total Thyroid Blood Test
Total T3 Blood Test for Thyroid Hormone Screening and Hyperthyroid Evaluation
The T3 Total Thyroid Blood Test measures the total amount of triiodothyronine, also called T3, in the blood.
T3 is an active thyroid hormone that helps regulate metabolism, energy use, heart rate, body temperature and many other body functions.
This test may be useful when checking thyroid hormone activity, following up on abnormal thyroid results or evaluating possible overactive thyroid patterns when directed by a healthcare provider.
✔ Measures total T3 thyroid hormone
✔ Useful for thyroid hormone screening
✔ May help evaluate overactive thyroid patterns
✔ Doctor's order included
✔ No insurance required
✔ Convenient online ordering
⏱ Typical turnaround: results are usually emailed in 1–3 days.
What Is T3?
T3, also known as triiodothyronine, is one of the main thyroid hormones in the body.
T4 is often converted into T3, and T3 is considered the more active thyroid hormone at the tissue level.
A Total T3 test measures both protein-bound T3 and free T3 together.
What This Test Measures
This blood test measures total triiodothyronine in the blood.
- Test name: T3 Total Thyroid Blood Test
- Also known as: Total T3 Test, Triiodothyronine Test, T3 Blood Test
- Sample type: Blood
- Purpose: Measures total T3 thyroid hormone
- Common use: Thyroid hormone screening and provider-directed follow-up
Why Order a Total T3 Blood Test?
A total T3 test may be ordered when a person or healthcare provider wants more information about thyroid hormone activity.
This test may be considered for:
- Possible overactive thyroid evaluation
- Follow-up to abnormal TSH or T4 results
- Thyroid hormone screening
- Monitoring known thyroid conditions when directed by a provider
- Evaluating possible T3 thyrotoxicosis when T4 is normal or borderline
- Provider-directed endocrine testing
- Customers who want direct access to lab testing without using insurance
Who May Consider This Test?
This test may be appropriate for:
- Individuals whose healthcare provider requested a total T3 test
- People following up on abnormal thyroid lab results
- People with symptoms that may be related to overactive thyroid activity
- Individuals monitoring thyroid hormone levels under medical guidance
- Customers who want a simple thyroid-related blood test without insurance billing
Common Thyroid-Related Reasons for Testing
Total T3 may be checked when symptoms or previous lab results suggest thyroid hormone levels need further review.
- Fast or irregular heartbeat
- Anxiety, shakiness or nervousness
- Unexplained weight loss
- Increased sweating or heat intolerance
- Fatigue or muscle weakness
- Frequent bowel movements
- Sleep problems
- Follow-up to abnormal TSH, T4 or thyroid panel results
Total T3 vs Free T3
A Total T3 test measures both protein-bound T3 and free T3 together.
A Free T3 test measures only the portion of T3 that is not attached to proteins.
Depending on your reason for testing, your healthcare provider may recommend TSH, Free T4, Total T4, Free T3, thyroid antibodies or a full thyroid panel for a more complete thyroid evaluation.
Total T3 vs T3 Uptake
Total T3 and T3 Uptake are not the same test.
A Total T3 test measures the T3 hormone level in the blood. T3 Uptake is a different thyroid-related test that helps evaluate thyroid-binding protein activity and may be used with Total T4 to calculate a Free T4 Index.
Important Biotin Warning
Biotin, also called vitamin B7, is commonly found in hair, skin and nail supplements and may interfere with some thyroid lab tests.
If you take biotin or high-dose supplements, ask your healthcare provider whether you should stop taking it before testing.
Important Health Warning
If you have chest pain, severe shortness of breath, fainting, confusion, severe weakness, very fast or irregular heartbeat, severe neck swelling, trouble swallowing, severe dehydration or any urgent medical concern, seek medical care promptly.
Do not use this test as a substitute for urgent medical evaluation, diagnosis or treatment.
Screening and Lab Access Only
LabReqs and SchoolTiters provide access to lab testing. We do not diagnose thyroid disease, prescribe thyroid medication, adjust thyroid medication or manage thyroid treatment.
This test may provide useful thyroid-related lab information, but results should be reviewed with a licensed healthcare provider, especially if symptoms are present, results are abnormal or medication changes are being considered.
Important Limitations
- This test measures total T3 only.
- This test does not include TSH unless ordered separately.
- This test does not include Free T4, Total T4, Free T3 or thyroid antibodies unless ordered separately.
- T3 testing is often more useful for evaluating hyperthyroid patterns than hypothyroid patterns.
- Total T3 may be affected by pregnancy, estrogen use, birth control pills, medications, supplements and thyroid-binding protein changes.
- This test does not diagnose Graves disease, thyroiditis, thyroid nodules, hypothyroidism or hyperthyroidism by itself.
- Do not start, stop or change thyroid medication based only on this result.
Before Ordering
- Confirm that you need Total T3 and not Free T3 or T3 Uptake.
- If your provider ordered this test, follow their instructions.
- If you take biotin, thyroid medication, birth control, hormone therapy or supplements, ask your provider how this may affect results.
- If you need a more complete thyroid evaluation, consider ordering TSH with Free T4 or a thyroid panel.
- If your result is abnormal, review it with a licensed healthcare provider.
How It Works
- Order online.
- Receive your lab order. A doctor's order is included.
- Visit a participating lab location.
- Provide a blood sample.
- Receive your results. Review abnormal results with a healthcare provider.
Why Choose This Total T3 Test?
✅ Simple thyroid hormone blood test
✅ Measures total triiodothyronine T3
✅ Useful for provider-directed thyroid screening
✅ May help evaluate overactive thyroid patterns
✅ Doctor's order included
✅ No insurance required
✅ Convenient online ordering
✅ Results can be shared with your healthcare provider
Frequently Asked Questions
What does the Total T3 Blood Test measure?
This test measures total triiodothyronine, also called total T3, in the blood.
Is Total T3 the same as Free T3?
No. Total T3 measures both bound and free T3 together. Free T3 measures only the portion of T3 that is not attached to proteins.
Is Total T3 the same as T3 Uptake?
No. Total T3 measures the T3 hormone level. T3 Uptake is a different thyroid-related test used to help assess thyroid-binding protein activity.
Can this test diagnose thyroid disease?
No. This test provides thyroid hormone information but does not diagnose thyroid disease by itself. Results should be reviewed with symptoms, medical history and other thyroid tests.
Should I also order TSH?
TSH is commonly used as an initial thyroid screening test. Many thyroid evaluations include TSH with Free T4, Total T4, T3 or a thyroid panel depending on the provider's reason for testing.
Can biotin affect thyroid test results?
Yes. Biotin may interfere with some thyroid lab tests. If you take biotin, ask your healthcare provider whether you should stop it before testing.
Is this test useful for hypothyroidism?
Total T3 is generally more useful for evaluating possible overactive thyroid patterns. Hypothyroidism is commonly evaluated with TSH and Free T4, but your provider may order T3 depending on your situation.
Is a doctor's order included?
Yes. A doctor's order is included with this lab test.
Order Your T3 Total Thyroid Blood Test
Use this test when you need convenient access to total T3 thyroid hormone testing for screening, follow-up or provider-directed thyroid evaluation.
Order your T3 Total Thyroid Blood Test today.
T3 Total Thyroid Test
$ 89.99
