FT3/FT4 Ratio Question

[clethe]

Using thyroid.chingkerrs.online/ But don't know what the results of my T4:T3 Ratio mean? Are there high or low 'ranges' one should be concerned about?

TSH 0.016 mIU/L (0.45 - 4.50) -10.7%

Free T4 (fT4) 1.41 pmol/L (0.82 - 1.77) 62.1%

Free T3 (fT3) 2.7 pmol/L (2.0 - 4.4) 29.2%

T4:T3 Ratio 0.522 

Currently taking 100mcg Synthroid + 10mcg Liothyronine 4 AM, and 10mcg Liothyronine Noon.

Thank you for help with this question 🙂

[TiggerMe]

The ratio is only important when on T4 only to see how well it is converting to fT3, your fT3 is still on the low side, if you are still symptomatic a small increase is probably a good move to get it above 50%

[clethe in reply to TiggerMe]

OK thanks for the clarification! Low-normal FT3 symptoms have been an ongoing problem but is very slowly improving with positive med changes, will be discussing latest labs with Endo next week 👍

[SlowDragon Administrator]

Recommended that all thyroid blood tests early morning, ideally just before 9am, only drink water between waking and test and last dose levothyroxine 24 hours before test

This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip)

T3 ….day before test split T3 as 2 or 3 smaller doses spread through the day, with last dose approximately 8-12 hours before test

is this how you do your tests?

What vitamins are you taking

When were vitamin D, folate, ferritin and B12 last tested