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Thyroid Cancer, Nodules & Hyperthyroidism (Expert Forum)
Hyperthyoid? - Test results confusing!
Answered by
Mark Lupo, M.D. - Thyroid Nodules, Thyroid Cancer, hyperthyroidism, hypothyroidism, Thyroid Ultrasound
Thyroid & Endocrine Center of Florida
Sarasota - FL
Questions in the Thyroid forum are answered by Mark Lupo, MD. Topics covered include Goiter, Graves Disease, Hyperthyroid, Parathyroid/Calcium Problems, Thyroid Cancer, Thyroid Nodules/Cysts, Thyroiditis, Thyroid & Pregnancy, Thyroid Stimulating Hormone (TSH), Thyroid Tests, and Thyroid Surgery.
Hyperthyoid? - Test results confusing!
by marctilly, Feb 01, 2007 12:00AM
My recent (1/18/07) blood test results are:
Free T4 1.10 (Range 0.59-2.19 ng/dL)
Free T3 5.32 (Range 2.77-5.27 pg/mL)
TSH 3.09 (Range 0.465-4.680 uIU/mL)
On 3/27/06 my TSH was 1.98
From what I can tell the AACE changed the TSH range to 0.3-3.0 in 2002 but many Drs. and labs are not aware of (or don't agree with?) this.
Finally, the results from a thyroid uptake test (completed yesterday) were:
6 hours - 19%
24 hours - 33.9%
The radiologist indicated that the thyroid pictures showed no abnormalities (nodules, etc.) but that my uptake results indicated a hyperthyroid state. From what I can tell, this kind of TSH level (normal or high) with elevated free T3 and uptake results is unusual, and perhaps not indicative of a problem with the thyroid directly.
I have some symptoms that are consistent with hyperthyroid and some that are more typical of hypothyroid.
Feedback would be appreciated.
Marc
Free T4 1.10 (Range 0.59-2.19 ng/dL)
Free T3 5.32 (Range 2.77-5.27 pg/mL)
TSH 3.09 (Range 0.465-4.680 uIU/mL)
On 3/27/06 my TSH was 1.98
From what I can tell the AACE changed the TSH range to 0.3-3.0 in 2002 but many Drs. and labs are not aware of (or don't agree with?) this.
Finally, the results from a thyroid uptake test (completed yesterday) were:
6 hours - 19%
24 hours - 33.9%
The radiologist indicated that the thyroid pictures showed no abnormalities (nodules, etc.) but that my uptake results indicated a hyperthyroid state. From what I can tell, this kind of TSH level (normal or high) with elevated free T3 and uptake results is unusual, and perhaps not indicative of a problem with the thyroid directly.
I have some symptoms that are consistent with hyperthyroid and some that are more typical of hypothyroid.
Feedback would be appreciated.
Marc
Doctor's Answer
by Mark Lupo, M.D., Feb 03, 2007 12:00AM
, Feb 03, 2007 12:00AM
I would watch the Free T3 -- if this continues to elevate and the TSH does not become low, then the concern would be pituitary over-production of TSH (RARE) -- and that would necessitate a brain/pituitary MRI. This is very rare, and more likely, you may simply run a high normal T3. The 33.9% uptake at 24h is only slightly high and not diagnostic of hyperthyroidism in this setting. An elevated blood T3-Uptake (older type of test) would be consistent with hyperthryoidism. A blood prolactin level would help screen for pituitary issues, but would not be 100% for/against this.
At this time, following the trend will be most important.
At this time, following the trend will be most important.
