TSH is the test used to diagnose hypothyroidism. T3 is active form of
thyroid hormone responsible for its function. Your TSH and T3 is normal. T4 which is little low is not significant to categorize hypothyroidism or need for medicine.
I would not worry this lab value which does not help diagnose hypothyroidism
Next Steps
Check
TSH, free T4 and total 3 in 4 weeks to assess any change from this baseline .