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(Important note: STTM is an information-only site based on what many patients have reported or learned in their treatment. Please work with your doctor. This is not meant to replace that relationship or guidance, and you agree to that by reading this website. See the Disclaimer.)

Have you ever discovered that your free T3 lab result was very high and/or over-the-range with continuing symptoms or a low free T4??

This phenomena is what we, as thyroid patients, call “pooling”.

Pooling means your free T3 isn’t making it well to your cells, and instead, is hanging out in your blood, going higher and higher as you raise your T3-containing medication like Cytomel or natural desiccated thyroid.

You may or may not know it’s happening at first. But sooner than later, pooling can end up promoting excess adrenaline and hyper-like symptoms as a result. And it can also increase hypothyroid symptoms.

What are symptoms patients experience due to pooling, which pushes excess adrenaline?

They are individual. Some people notice nothing. Some notice increased hypothyroid symptoms. Others notice symptoms such as anxiety, panicky feeling, shakiness, heart palps, higher heartrate, higher blood pressure, etc. Other issues can cause those latter excess adrenaline symptoms, too, but we do notice them when pooling, as well.

How do I know by my labwork that I’m pooling??

Exactly as explained above. First, you may see a free T3 towards the top of the range (where it seems to end up when we are optimal on NDT, for example), YET, there will be continued symptoms of hypo or symptoms of excess adrenaline. So though it “looks” optimal, it may actually be pooling. Or we may see a high-in-the range T3 with a free T4 that’s lower in its range. Or the free T3 can be OVER-range with continued issues and a lower FT4. It’s not always easy to discern, but hopefully those observations help based on what we’ve seen.

What causes pooling?

For most thyroid patients, it seems to be because of one or both of two problems: inadequate levels of iron and/or  a cortisol problem, whether too low, or too high. Also accompanying pooling sooner or later, and if you are using Natural Desiccated Thyroid or T4 in your treatment, is rising Reverse T3 (RT3)–the inactive hormone that if in growing amounts, contributes to the “pooling” since it’s competing for the same cell receptors as T3, and blocking the door! T4 in higher amounts converts to RT3 if you have an iron or cortisol problem!

A high FT3 will also mean your RT3 ratio can look good, but it may not be!

But my iron is normal/fine/good, as is my cortisol!

Lab results have nothing to do with just falling in the normal range. They have to do with where they fall in those ranges. Your doctor probably doesn’t yet get this, so you don’t either.  Additionally, we learned the hard way years ago that cortisol testing needs to be the 4-point saliva test, NOT blood, as the former will measure what is available to your cells, plus at four key times during a 24 hour period.  Always compare your results to this Lab Values page.

Do pooling and a high Reverse T3 come together?

Not always. From looking at each other’s labs, some will see pooling first without having an excess of RT3. Later, if they continue to raise NDT, the RT3 dominance can occur.

If I have no symptoms of pooling, yet it’s very clear with labs, do I not have a problem?

No, you still have a problem and need to treat the pooling, we’ve discovered, which is usually always about inadequate iron or a cortisol issue.

What is the treatment solution?

First and foremost, we discover and start treating the causes of pooling by ordering a 24 hour adrenal saliva test and all four iron labs, here. And we found repeatedly that that results have nothing to do with falling in the normal range. They have to do with “where” in those ranges they fall. See //

In the meantime, patients lower their Natural Desiccated Thyroid or T3 only, sometimes more than half, allowing the pooled T3 to fall, and which can happen within a week if lowered enough…and may take longer to fall if one is only on NDT. Patients then report they can add back in a small amount of straight T3 (i.e. T3 to the lowered NDT they were now on, or T3 to the smaller amount of T3 they were now on), and raise in small increments to alleviate symptoms of hypo. How much added T3? 10 mcg T3 is a good starting dose to add back in, or half a 25 mcg tablet to equal 12.5 mcg if you only have the larger tablets. As symptoms of hypo return, patients may add smaller increments of T3. But it’s important to remember that your T3 will pool again if you haven’t treated the reasons for it, so judicious use of the added T3 is important. 

Bottom line

We’ve learned how very important it is, before raising NDT or T3, to see where our adrenals stand, and all four iron labs, by comparing the results to the Lab Values page, then treating if we see a problem. Or at the least, to test more often as we are raising to catch it!

**Read more about IRON AND CORTISOL.