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TSH dropping

Hello, I am writing to see if anyone is aware of the implications of a dropping TSH level that remains in a normal range. One year ago my TSH level was 1.64ulU/ml (normal range 0.40-4.00). This year the level has dropped to 1.37. I also had a low sodium level: 133 mmol/L with the normal range being 134-145. Fortunately, I had a second sodium reading and it came back at 138, which is in the normal range. However, I've had several symptoms that include muscle weakness/fatigue, periods of nausea, and lightheadedness. I wonder if seeing an endocrenologist is warranted. Thank you for any insights.

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Avatar universal
I'm sorry, but isn't it your dog you should be taking to the GP?  LOL  Some of our members have endos, some have GPs, some have integrated medicine specialists, but you're the first one I've heard of with a vet!!!  My vet said that the joke among vets is that they are doctors who know how to treat more than one species...guess she's right!
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Avatar universal
What is your potassium level?  My vet (yes my dog's doctor) just pointed out to me that my low sodium number should be compared to my potassium level-the ration between them can point to Addison's.
My vet has diagnosed me with  autoimmune poyglandular disorder.  Now off to my general practioner to see if we think this is worth a trip to an endo.
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Avatar universal
That's really a very insignificant drop in TSH.  TSH varies considerably, even intraday, so something as seemingly insignificant as the time of day the blood was drawn can affect it that much and more.  However, if you really want a more complete thyroid profile, ask for free T3 and free T4 to be tested.  T3 and T4 are the actual thyroid hormones, and their levels say much more about thyroid function than TSH.  Your PCP can order those test for you...I doubt you need to see an endo unless they should come back questionable.
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Mine has dropped to 0.37 in November from July being a little high at 5.46. I’m curious why the major drop as well.
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