Free T3: units, conversion and tracking
Updated
Short answer
Free T3 is reported in pg/mL, pmol/L and ng/dL. 1 pmol/L = 0.651 pg/mL.
Convert free T3
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 T3?
The unbound form of triiodothyronine, the more active thyroid hormone.
BiomarkerHQ groups free T3 under Thyroid. On lab reports it can also appear as ft3, t3 free, free triiodothyronine, triiodothyronine free and triiodothyronine t3 free.
Free T3 units and conversion
BiomarkerHQ stores each free T3 result in the unit printed on the report, and charts and compares results in pg/mL.
1 pmol/L = 0.651 pg/mL
1 pg/mL = 1.536 pmol/L
1 ng/dL = 10 pg/mL
1 pg/mL = 0.1 ng/dL
| pmol/L | pg/mL |
|---|---|
| 3 pmol/L | 1.953 pg/mL |
| 4 pmol/L | 2.604 pg/mL |
| 5 pmol/L | 3.255 pg/mL |
| 6 pmol/L | 3.906 pg/mL |
| 7 pmol/L | 4.557 pg/mL |
| 8 pmol/L | 5.208 pg/mL |
| 9 pmol/L | 5.859 pg/mL |
| pg/mL | pmol/L |
|---|---|
| 2 pg/mL | 3.072 pmol/L |
| 2.5 pg/mL | 3.84 pmol/L |
| 3 pg/mL | 4.609 pmol/L |
| 3.5 pg/mL | 5.377 pmol/L |
| 4 pg/mL | 6.145 pmol/L |
| 4.5 pg/mL | 6.913 pmol/L |
| 5 pg/mL | 7.681 pmol/L |
For another value, use the lab unit converter. It converts units only and does not interpret a result.
Tracking free T3 over time
In BiomarkerHQ, each free T3 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 T3 in?
Free T3 is reported in pg/mL, pmol/L and ng/dL. BiomarkerHQ stores each result in the unit printed on the report and uses pg/mL for charts and comparisons.
How do I convert free T3 from pmol/L to pg/mL?
1 pmol/L = 0.651 pg/mL. For example, 6 pmol/L is 3.906 pg/mL.
How do I convert free T3 from pg/mL to pmol/L?
1 pg/mL = 1.536 pmol/L. For example, 3.5 pg/mL is 5.377 pmol/L.
Does BiomarkerHQ interpret my free T3 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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