FT3 to FT4 ratio

[destiny234]

UK. Can anyone tell me what the ratio is for my FT3 ...4.5 and FT4 ...19.5 test? And how to do it.

I found a calculator that said it was 4.333 but I am not sure this is right

Many thanks in anticipation 😁

[pennyannie]

Hello Destiny :

You just need to divide the T4 result by the T3 result - and that looks about right - so slightly wide of the centre :

The accepted conversion ratio, when on T4 monotherapy, once the T4 is in the top quadrant of its range, is said to be -

1 / 3.50 - 4.50 T3/T4 with most hypothyroid people feeling at their best when they come in this ratio at 4 or under :

No thyroid hormone replacement works well until your core strength vitamins and minerals

- those of ferritin, folate, B12 and vitamin D are up and maintained at optimal and

conversion can also be down regulated by any physiological stress ( emotional or physical ) inflammation, antibodies, depression, dieting and ageing - so rather more complex subjects but thought worth mentioning.

[destiny234 in reply to pennyannie]

Thank you 😀