Re: Please help me Interpret my 24 hour urinary Thyroid test

[Guest guest]

Hi Kit

1) FT3: 910 pmol/24h (Reference Range 592-1850 pmol/24h)

This is very low, your free T3 should be up there in the upper third

of the reference range and it's only half way in the range.

2)

FT4: 275 pmol/24h " LOW " (Reference Range 347 -1994 pmol/24h)

This is BELOW the bottom of the reference range.

What I don't understand: T3 is derived from T4. So how is it possible to have a

decent T3 reading but a T4 which is off the chart?

How much thyroid hormone replacement are you taking and are you

taking synthetic thyroxine, T3 or natural thyroid extract?

I checked out LabsOnLine to see if there was anything there and

found the following: Discuss this with your doctor Kit http://www.labtestsonline.org/understanding/analytes/t4/test.html

TSH

T4

T3

InterpRetation

High

Normal

Normal

Mild

(subclinical) hypothyroidism

High

Low

Low

or normal

Hypothyroidism

Low

Normal

Normal

Mild

(subclinical) hyperthyroidism

Low

High

or normal

High

or normal

Hyperthyroidism

Low

Low or

normal

Low or

normal

Non-thyroidal

illness; rare pituitary (secondary) hypothyroidism

http://www.drlam.com/articles/hypothyroidism.asp?page=3

It is common to find Free T3 and Free T4 below normal when TSH

could in the normal range or in the low end of the normal range. This is

indicative of secondary or tertiary hypothyroidism. This is normally thought of

as due to hypothalamus or pituitary dysfunction, resulting in the body's

inability to convert T4 to T3.

Primary hypothyroidism,

means the thyroid gland doesn't produce an adequate amount of thyroxine (T4).

Secondary hypothyroidism

develops when the pituitary gland does not release enough of the

thyroid-stimulating hormone (TSH) that prompts the thyroid to manufacture more

thyroid hormone T3 and T3.

Tertiary

hypothyroidism

results from a malfunction of the hypothalamus, the part of the brain that

controls the endocrine system.

Primary,

secondary and tertiary hypothyroidism is associated with insufficient secretion

by the thyroid, the pituitary or the hypothalamus gland, thereby reducing the

mainly inactive T4 available for conversion, to the active

hormone T3 to energise the body. In the majority of cases, Type 1

Hypothyroidism may be corrected by using levothyroxine (T4-only) replacement.

Hope

that helps.

Luv

- Sheila

Thanks,

Kit.

[Guest guest]

>>Secondary hypothyroidism develops when the pituitary gland does not release enough of the thyroid-stimulating hormone (TSH) that prompts the thyroid to manufacture more thyroid hormone T3 and T3.<<<<

I think that should be T4 and T3

Lilian

[Guest guest]

Correct Lilian, that should have read T4 and T3. Thanks.

Luv - Sheila

>>Secondary hypothyroidism develops when the pituitary gland does not release

enough of the thyroid-stimulating hormone (TSH) that prompts the thyroid to

manufacture more thyroid hormone T3 and T3.<<<<

I think that

should be T4 and T3

Lilian

[Guest guest]

I'm currently not on any thyroid medication. My last NHS tsh test showed me as

something " 2.4 " . That was " normal " so the GP said there was nothing wrong.

[Guest guest]

Sorry if this is a double post. I just mean to say: I am not on any thyroid

treatment. My TSh is 2.4/1.75 according to different tests.

[Guest guest]

Well, a TSH of 2.4 is not normal. Normal is around 1.0. It

appears that if any blood tests come back ANYWHERE within a reference range,

doctors will tell you that it is normal and you don't have a problem. Doesn't

it matter to them whether you are at the top, the middle or the bottom of the

range, so long as you are inside it???

Luv - Sheila

I'm currently not on any thyroid medication. My last NHS tsh test showed me as

something " 2.4 " . That was " normal " so the GP said there was

nothing wrong.

[Guest guest]

Hi

I tried replying but it didn't come through.

> What I don't understand: T3 is derived from T4. So how is it possible to have

a decent T3 reading but a T4 which is off the chart?

See Dr Rind's site http://www.drrind.com/therapies/thyroid-scale

* had a thyroidectomy to remove a cancerous tumor. He was healthy

otherwise. His thyroid hormone replacement of 75mcg Synthroid is not enough to

meet his needs. He is hypothyroid.

* Thyroid lab values show are: TSH = 5 (high), FT4 = 0.7 (low), FT3 = 280 (lower

than optimal but relatively higher than T4)

What does this mean: The pituitary gland is sensing insufficient thyroid energy

and is therefore sending a strong signal to the (absent) thyroid gland telling

it to make more T4. Because there is insufficient T4, the body can compensate by

converting T4 to T3 at a higher than usual rate, hence we see a T3 that is

higher than T4 on a relative scale.

===

In his book, Dr hertoghe said " watch out for low levels of T3 (under 1500

pmol/24h) and/or t4 (under 1800 pmol/24h) "

>

>

>

>

>

> The FT3 result is within the green range of the little traffic light (albeit

toward the lower edge). But the FT4 is completely outside is completely outside

its reference range (below the lower edge).

>

> What I don't understand: T3 is derived from T4. So how is it possible to have

a decent T3 reading but a T4 which is off the chart?

>

>

> Thanks,

>

> Kit.

>

[Guest guest]

> " In his book, Dr hertoghe said " watch out for low levels of T3 (under 1500

pmol/24h) and/or t4 (under 1800 pmol/24h) " "

>

Thanks Chris... by that reckoning, I think a 910T3 and a 725 T4 is pretty

definitive.