Free T4: units, conversion and tracking
Updated
Short answer
Free T4 is reported in ng/dL, pmol/L and pg/mL. 1 pmol/L = 0.07769 ng/dL.
Convert free T4
Enter a value to see the converted result.
Converts units only and does not interpret a result. For other markers, use the full unit converter.
What is free T4?
The unbound form of thyroxine, the main hormone made by the thyroid gland.
BiomarkerHQ groups free T4 under Thyroid. On lab reports it can also appear as ft4, t4 free, free thyroxine, thyroxine free, free thyroxine t4 and thyroxine t4 free.
Free T4 units and conversion
BiomarkerHQ stores each free T4 result in the unit printed on the report, and charts and compares results in ng/dL.
1 pmol/L = 0.07769 ng/dL
1 ng/dL = 12.87 pmol/L
1 pg/mL = 0.1 ng/dL
1 ng/dL = 10 pg/mL
| pmol/L | ng/dL |
|---|---|
| 8 pmol/L | 0.6215 ng/dL |
| 10 pmol/L | 0.7769 ng/dL |
| 12 pmol/L | 0.9322 ng/dL |
| 14 pmol/L | 1.088 ng/dL |
| 16 pmol/L | 1.243 ng/dL |
| 18 pmol/L | 1.398 ng/dL |
| 20 pmol/L | 1.554 ng/dL |
| ng/dL | pmol/L |
|---|---|
| 0.6 ng/dL | 7.723 pmol/L |
| 0.8 ng/dL | 10.3 pmol/L |
| 1 ng/dL | 12.87 pmol/L |
| 1.2 ng/dL | 15.45 pmol/L |
| 1.4 ng/dL | 18.02 pmol/L |
| 1.6 ng/dL | 20.6 pmol/L |
| 1.8 ng/dL | 23.17 pmol/L |
For another value, use the lab unit converter. It converts units only and does not interpret a result.
Tracking free T4 over time
In BiomarkerHQ, each free T4 result is saved with its collection date, its unit and the reference range printed on that report. The timeline charts the results across your draws against the range from each of your own reports, and any two draws can be compared side by side.
- Keep the unit printed on each report. Convert only to compare.
- Keep each report's own range with its result. See why ranges differ between labs.
- Compare the same lab and conditions where you can. See how to compare two blood tests.
Frequently asked questions
Which units do labs report free T4 in?
Free T4 is reported in ng/dL, pmol/L and pg/mL. BiomarkerHQ stores each result in the unit printed on the report and uses ng/dL for charts and comparisons.
How do I convert free T4 from pmol/L to ng/dL?
1 pmol/L = 0.07769 ng/dL. For example, 14 pmol/L is 1.088 ng/dL.
How do I convert free T4 from ng/dL to pmol/L?
1 ng/dL = 12.87 pmol/L. For example, 1.2 ng/dL is 15.45 pmol/L.
Does BiomarkerHQ interpret my free T4 result?
No. It compares a result only with the reference range printed on your own lab report, as below, within or above, and does not say what the result means. Talk to a qualified clinician about your results.
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