READ ME, READ ME–VERY IMPORTANT:
1) You need to put your “free T3” (or total T3) in the box above FIRST, then put your RT3 result second, for this to work correctly. Then your ratio will show up right above–don’t miss it! It’s small.
2) If your FT3 is above the range (i.e. if you are pooling), you may have a better-looking ratio than you really have if you weren’t pooling. (Pooling means having T3 build high in the blood because it’s not getting to your cells—usually due to low cortisol, high cortisol, or low iron)
3) There seems to be a problem for those who have BOTH the free T3 and RT3 in the pg/mL measurements. i.e. if you get a double or triple digit number, it may be missing a decimal. For example, 83 may be 8.3.
To understand your result, go back to here to learn why it’s happening and what to do about it.
Why am I trying to find my ratio?
Excess Reverse T3 is a growing problem for thyroid patients. It can be caused from chronic adrenal dysfunction (too high cortisol; too low cortisol) as well as having low ferritin/iron problems. Even low B12 and other imbalances, plus chronic stress, can cause the excess. You can read about the RT3 problem here.
Why can’t I just go by the RT3 result by itself?
Because just the RT3 lab result may not tell the story. It may “look” normal, but may not be in relation to the Free T3. You have to find out the ratio between your RT3 and the Free T3 (or total T3).
What result am I looking for?
With the “free T3″/RT3 ratio, healthy ratios will be 20 or higher. With a “total T3″/RT3 ratio, you are looking for 10 or higher.
Your two lab results can come in different units of measure, making it hard for the “math-challenged” to know how to convert the measurements into the same units in order to find the ratio. See below about conversion to the same units.
Does high Free T3 due to pooling cause any problems with the ratio?
Yes. You may have a better-looking ratio than you really have if you weren’t pooling. (Pooling means having T3 build high in the blood because it’s not getting to your cells—usually due to low cortisol, high cortisol, or low iron)
Is there a calculator I can use just to change from one unit of measurement to another?
Yes, try this one: http://www.mens-hormonal-health.com/hormone-unit-conversion-calculator.html This is not going to give you your RT3 ratio, but it can give you a measurement to put in the down-arrow above in case your particular measurement isn’t shown above.
What can I do if have a ratio that points to an RT3 problem?
This page will explain.