Test library
Comprehensive Thyroid Function Test
The thyroid function panel with TSH measures several markers of thyroid activity, including TSH, T3 uptake, T4, and a calculated T7 index. It is used to help determine whether the thyroid is functioning properly.
Order Thyroid Test Panel with TSH
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Thyroid Test Panel with TSH- Typical turnaround
- 1-3 business days
- Starting price
- From $118
- Results
- Confidential, online
Quick answer
The thyroid function panel with TSH combines several measurements to assess how well the thyroid gland is working. It includes thyroid-stimulating hormone, T3 uptake, T4, and a calculated T7 index that adjusts the T4 result. The panel is ordered when symptoms suggest an overactive or underactive thyroid and is interpreted by a qualified healthcare provider.
What this test measures
The thyroid gland controls metabolism through hormones such as thyroxine and triiodothyronine. The pituitary gland releases thyroid-stimulating hormone, or TSH, to regulate the thyroid. Measuring TSH alongside thyroid hormone levels helps show whether the gland is being driven too hard, not enough, or responding normally.
The panel uses a blood sample and reports several values. T3 uptake estimates how much binding capacity is available for thyroid hormones, T4 measures total thyroxine, and the T7 index is calculated from T3 uptake and T4 to give an adjusted estimate of free thyroxine. Together these markers offer a traditional view of thyroid function.
Clinicians order this panel to investigate fatigue, weight change, temperature sensitivity, or a visible goiter. It can also be used to follow a known thyroid condition. Results are reviewed as a set, and a qualified healthcare provider determines whether any further testing or care is appropriate.
- Thyroid-stimulating hormone (TSH)
- T3 uptake (thyroid hormone binding ratio)
- Total thyroxine (T4)
- T7 index (free thyroxine index)
- Free thyroxine (free T4) when added
- Free triiodothyronine (free T3) when added
- Thyroid peroxidase antibodies when added
Why people order this test
- Evaluate symptoms of an underactive or overactive thyroid
- Check thyroid function when fatigue or weight changes occur
- Monitor a known thyroid condition
- Screen for thyroid problems with a provider
- Follow up on an earlier abnormal thyroid result
How to prepare
No fasting is usually required for this blood test. A sample is collected from a vein, usually at the arm. Tell the ordering provider about any thyroid medications, since timing relative to a dose can affect results.
Understanding your results
Results are typically available within one to three business days. The report lists each thyroid marker with its reference range, and the values are interpreted together. A qualified healthcare provider determines what the combined picture suggests and whether follow-up is needed.
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Frequently Asked Questions
What does the thyroid function panel include?
It includes TSH, T3 uptake, total T4, and a calculated T7 index that adjusts the T4 value for binding.
Why is TSH measured with thyroid hormones?
TSH reflects the pituitary's signal to the thyroid. Reviewing it with hormone levels helps show how the thyroid is responding.
What is the T7 index?
It is a calculated value that combines T3 uptake and total T4 to estimate the amount of free thyroxine available.
Do I need to fast?
Fasting is not usually required, but follow the laboratory's instructions if additional tests are included in the order.
Can thyroid medication affect the results?
Yes. Some thyroid medications can change these values, so sharing a current medication list with the ordering provider supports accurate interpretation.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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