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| English | Russian |
| free T4 | T4св (MyMedPharm_Info) |
| free T4 | Т4св (MyMedPharm_Info) |
| Free T4 Index | индекс свободного тироксина (тж. FTI (free thyroxine index): Most adults with free thyroxine levels slightly below the reference range have normal free T4 index values 'More) |