I just received lab results showing the following: thyroid tsh 15.060 high thyroxine (t4) 6.2 t3 uptake 26 free thyroxine index l.6?

Subclinical Hypothyr. Your TSH is quite high with normal t4, it suggest you have subclinical hypothyroidism, it may be due to hashimoto disease and need to check for antithyroid antibodies and need to ba treated with replacement thyroid hormone till TSH comes down to within normal range consult your doctor or an endocrinologist.
Thyroid function. It looks like your TSH is moderately high, and your free T4 is normal (depending on the normal range for these tests, which varies). See your doctor. Your thyroid may be in the early stages of failing.