The blood test measures Tsh(see above).
Tsh alone may not tell the whole story.
High Tsh levels may be caused by:.
Low Tsh levels mean that you're producing too
much thyroid hormone.
It's usually ordered if T4 tests and Tsh test suggest hyperthyroidism.
It's usually ordered if T4 tests and Tsh tests suggest hyperthyroidism.
T3, T4 and Tsh test checks the thyroid levels in the body.
This test is done if the T4 and Tsh tests suggest hyperthyroidism.
The dose of CYTOMEL should target Tsh levels within the desired therapeutic range.
However, some people may have increased Tsh levels while having normal T4 Levels.
Some people have a raised Tsh level but have a normal T4 level.
When thyroid hormone levels are normal or high, your Tsh should be lower.
You should have a Tsh and perhaps a T4 as well or a T3.
The T4 test and the Tsh test are the two most common thyroid function tests.
So the short answer to your question is the best test is the Tsh level.
If the Tsh levels are below the normal range, it means the thyroid is underactive.
The values of Tsh in the blood can vary
but the following values are considered as normal:.
When more T4 is made by the thyroid gland, less Tsh is present in the blood.
If your T4 levels are low and Tsh levels are high, then you might have hypothyroidism.
By measuring the level of Tsh in the blood, we can determine how well
the thyroid is working.
Tsh stimulates the thyroid to produce its two hormones-
T3 and T4- and release them into the bloodstream.
The normal range for Tsh in most laboratories begins at about 0.3 milli international units,
MIUs, per deciliter.
If Tsh remains high over time,
and you have symptoms of hypothyroidism, then you may be started on treatment.
By measuring the level of Tsh in the blood, your doctor can determine how
well the thyroid is working.
The T4 test and the Tsh test are the two most common thyroid function tests
and are usually ordered together.
Once a nodule is detected, other procedures- a Tsh test and a thyroid scan-
can check for hyperthyroidism or hypothyroidism.