This convenient urine test measures free thyroid (T4 and T3) hormone levels. The report also gives the T4:T3 ratio, which gives an indication to whether T4 production or T4-T3 conversion, needs to be targeted with nutritional or pharmaceutical therapy.
Urine Test for Thyroxin (T4), Triiodothyronine (T3) and T4/T3 Ratio. First morning void or 24 hour urine collection