If you have tried the search box above with no luck, the only thing I can suggest is links like this.
https://www.mayoclinic.org/diseases-conditions/hyponatremia/expert-answers/low-blood-sodium/faq-20058465
No need to worry. Since you do not have the typical symptoms of being hypothyroid, I see no reason for the doctor to react to your TSH and give you thyroid med. TSH is affected by so many things that it is useful as a diagnostic only when at extreme levels. Your TSH is above range, and resulted in additional tests, as it should have. Your Free T4 was a bit lower than most people seem to need. You weren't tested for Free T3, so that should be done when you see the doctor. Also it would be good to test for thyroglobulin antibodies (TG ab), Vitamin D, B12 and ferritin. Other than that I would just continue to monitor how you are feeling. If you start to have symptoms, then that would be the time to consider thyroid med. Vitamin D should be at least 50, B12 in the upper part of its range, and ferritin should be at least 100. You can supplement as needed to optimize.
Just for info, I have had some osteopenia/osteoporosis. I told the doctor that I wanted to fix it myself. I researched a lot and learned all the vitamins/minerals needed for bone growth. When I put it all together I found that instead of taking all the individual vitamins/minerals, I could get all I needed by taking two Centrum Silver daily, along with a K2 pill.
Your Free T4 of .88 is only at 28% of a range that is far too brod and skewed to the low end. Fo your Free T4 is lower than most people seem to need. Hashi's shows up as a high TPO ab 90% of the time, but it can also show as a high TG ab. So to be sure about Hashi's you need the RG ab test as well. You said you have no symptoms, but let's be sure. Please review this list of typical hypothyroid symptoms used by the Mayo Clinic, and tell us which ones you have, if any.
Fatigue
Increased sensitivity to cold (temp. below 98.6 which is considered normal)
Constipation ( have to use fiber or laxatives)
Dry skin (have to use moisturizer)
Weight gain
Puffy face
Hoarseness
Muscle weakness
Elevated blood cholesterol level
Muscle aches, tenderness and stiffness
Pain, stiffness or swelling in your joints
Heavier than normal or irregular menstrual periods
Thinning hair
Slowed heart rate
Depression
Impaired memory
Enlarged thyroid gland (goiter)
insomnia/sleep apnea
When trying to assess a person's thyroid status an evaluation for symptoms typical of hypothyroidism is the most important consideration. After that tests for the biologically active thyroid hormones Free T4 and Free T3 (not the same as Total T4 and Total T3) should be done and compared to reference ranges. If multiple symptoms typical of hypothyroidism are present and FT4 and FT3 are in the lower part of their ranges, that is strong evidence for hypothyroidism. TSH is a pituitary hormone that is affected by so many things that TSH alone is not a reliable of indicator of an individual's thyroid status.
If you have no symptoms of being hypothyroid there is really no reason to start you on thyroid mediation. I do suggest that with your TSH level you should be tested for Free T4, Free T3, and for the possibility of an autoimmune disorder called Hashimoto's Thyroiditis. The test for Hashi's are Thyroid Peroxidase antibodies (TPO ab) and thyroglobulin antibodies (TG ab). If the tests for antibodies are positive that would mean you are in the early stages of Hashi's and will eventually need thyroid medication to relieve hypo symptoms.
Hi,
what was the reference range of the test. Typically some are up to about 3.5 and other labs up to about 5.0.
In any case your TSH is a bit high. This may indicate that you are hypothyroid.
Further testing of the active thyroid hormones (Ft3 and Ft4) may be recommended. If these are low, then the diagnosis would be confirmed. Treatment would be oral thyroid hormone.
How do you feel? If you are feeling tired / low energy this may also be contributed by thyroid.