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Thyroid Panel (Free T3, Free T4, TSH) Blood Test
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| Feature |
Labcorp
|
Quest Diagnostics
|
|---|---|---|
| Price | $62.99 | $24.49 |
| Results in | ~3 business days | ~5 business days |
| Sample type | Blood Serum | Blood Serum |
| Require fasting | No | No |
About the test
The Thyroid Panel (Free T3, Free T4, TSH) assesses key hormones involved in thyroid function. It helps evaluate overall thyroid health and is commonly used to diagnose conditions like hypothyroidism, hyperthyroidism, and monitor thyroid therapy.
Included biomarkers & Reference ranges
| Biomarker | Reference range |
|---|---|
| Thyroid-Stimulating Hormone (TSH) A pituitary hormone that signals your thyroid to produce hormone. The primary screening test for both underactive and overactive thyroid conditions. | 0.4–4.5 mIU/L |
| T3, Free (fT3) The unbound, biologically active portion of triiodothyronine (T3), the more potent thyroid hormone. Used to evaluate thyroid function. | 2.3–4.2 pg/mL |
| T4, Free (fT4) The unbound, biologically active portion of thyroxine (T4), your main thyroid hormone. A core marker for evaluating thyroid function. | 0.8–1.8 ng/dL |
Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.
Preparation
Labcorp lists no special preparation for this test.
- Specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For patients on hemodialysis, specimen collection should be delayed for 2 weeks.
How it works
- 1. Order online No referral or insurance
- 2. Get a requisition By email in 24–72 hours
- 3. Visit a draw center Bring a matching photo ID
- 4. Get results Securely by email
- These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Consultations
Not sure how to read your results? We can help.
Schedule a consultation with a Hormunity specialist. We’ll walk through every marker, interpret what it means for you, and map out the next steps for your care.
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