- Mar 2020
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www.ncbi.nlm.nih.gov www.ncbi.nlm.nih.gov
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CONCLUSION: A 1.5- and 1.3-μg/kg dosage calculation based on actual weight is currently the best estimation for levothyroxine replacement therapy after thyroidectomy.
1.5 mcg/kg comes to 102 mcg per 150 pounds. That's lower than I'd expected.
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Fig. 2.
These make good reference figures. Given that normal T3 values are around 100 ng/dL, Graves' patients had 2 to 7 times normal levels. This is good because it means the symptoms associated with hyperthyroidism may be only on the upper end. Supraphysiological therapeutic doses of T4 (500 mcg) are only 3 or so times the full replacement dose.
T3 values in painless thyroiditis were only 1 to 3 times normal, except for 1 outlier. Thus, I would predict few symptoms in painless thyroiditis.Or, perhaps, symptoms only in few patients.
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- Jan 2020
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www.ncbi.nlm.nih.gov www.ncbi.nlm.nih.gov
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0.01 (0.006–0.028)
It appears that even mild thyroid elevation radically cuts TSH. Makes sense.
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15.72 ± 10.1
Graves disease has a average free T3 at least 3 times the upper normal range. This implies that there is only a little bit of wiggle room between high thyroid status and thyrotoxicosis. However, free T4 is at about twice as high as upper normal, so the total thyroid activity may be closer to 3.5 or 4 times the upper normal (assuming that T4 is roughly 10 times less potent than T3)
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synapse.koreamed.org synapse.koreamed.org
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Fig. 2
Most thyroiditis patients had total T3 in the upper reference range. Free T4, on the other hand, was nearly all above reference range. Graves' disease had half somewhat elevated and half extremely elevated levels for bot total T3 and free T4. I now just need data on free T3 (which in my recollection would be expected to scale tightly with total T3, so I may be able to predict the values).
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