The free, active fraction of T4, the main hormone the thyroid secretes. A core thyroid marker alongside TSH.
$5.90
Every order site, cheapest first
All-in = the test price plus that site's one-time blood-draw or order fee. 6 of these sites have changed this price since our June baseline. Always confirm on the vendor's own site before ordering.
| Order site | Performing lab | Test | Draw fee | All-in | Status |
|---|---|---|---|---|---|
| Fitomics · Insider · Quest ↗ | Quest | $5.90 | - | $5.90 | verified |
| Fitomics · Insider · LabCorp ↗ | LabCorp | $8.90 | - | $8.90 | verified |
| DrSays · Subscription · LabCorp ↗ | LabCorp | $9.99 | - | $9.99 | verified |
| Fitomics · Insider · BioReference ↗ | BioReference | $13.90 | - | $13.90 | verified |
| Dirt Cheap Labs · LabCorp ↗ | LabCorp | $7.79 | $10.00 | $17.79 | verified |
| GoodLabs ↗ | Quest / LabCorp / BioReference | $6.00 | $12.00 | $18.00 | verified |
| M&M Labs and Diagnostics · LabCorp ↗ | LabCorp | $10.00 | $8.00 | $18.00 | verified |
| DrSays · No Sub · LabCorp ↗ | LabCorp | $9.99 | $9.99 | $19.98 | verified |
| Dirt Cheap Labs · Quest ↗ | Quest | $12.77 | $10.00 | $22.77 | verified |
| Marek · Quest ↗ | Quest | $13.00 | $10.00 | $23.00 | verified |
| OwnYourLabs · LabCorp ↗ | LabCorp | $17.00 | $6.00 | $23.00 | verified |
| Fitomics · Outsider · Quest ↗ | Quest | $6.90 | $20.00 | $26.90 | verified |
| JasonHealth · Quest ↗ | Quest | $10.00 | $18.00 | $28.00 | verified |
| Fitomics · Outsider · LabCorp ↗ | LabCorp | $10.90 | $20.00 | $30.90 | verified |
| Fitomics · Outsider · BioReference ↗ | BioReference | $14.90 | $20.00 | $34.90 | verified |
| Ulta Lab Tests · Quest ↗ | Quest | $25.95 | $12.95 | $38.90 | verified |
| WalkInLab ↗ | LabCorp / Quest | $39.00 | - | $39.00 | verified |
| Grass Roots Labs · Quest ↗ | Quest | $20.00 | $28.00 | $48.00 | verified |
| DiscountedLabs · Quest ↗ | Quest | $63.00 | $8.00 | $71.00 | verified |
| PrivateMDLabs ↗ | LabCorp / Quest | $88.00 | - | $88.00 | verified |
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Prices are collected periodically and can change or lapse. This is a research and education resource, not medical advice. Pricing framework and source data compiled by PedroDaGr8, reproduced with permission.