Free T4 by age and sex
How the usual range for free T4 changes with age, as labs print it.
AI-verified against cited sources. Awaiting expert review
The usual range at every age
The reference range labs print, for each age group. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.
Use the left and right arrow keys to step through the age groups. Every range is also in the table below.
| Who | Usual range |
|---|---|
| 1–5 | 0.85–1.75 ng/dL |
| 6–10 | 0.9–1.67 ng/dL |
| 11–19 | 0.93–1.6 ng/dL |
| 20+ | 0.82–1.77 ng/dL |
Sources: Labcorp, ARUP Laboratories, Quest Diagnostics Nichols Institute (listed in the Mayo Clinic Laboratories Extended Catalog, testcatalog.org), Thyroid