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Table 1 Thyroid hormone concentrations following administration of various combinations of massive doses of levothyroxine and triiodothyronine in order to “overcome” presumed malabsorption of levothyroxine

From: Adequate timing and constant supervision are the keys for successful implementation of levothyroxine or levothyroxine/paracetamol absorption test

Thyroid function tests (07.2017)
DateTimeTSH [μIU/ml]
[Ref. Range 0.4–4.0]
FT4 [pmol/l]
[Ref. Range 11.5–22.7]
FT3 [pmol/l]
[Ref. Range 2.76–6.45]
Daily dose
p.o.
Day 110:00> 754.123.06LT4 1700 μg and T3 40 μg
18:00nm*3.993.16
2:00nm4.832.95
Day 210:00nm4.673.27LT4 1700 μg and T3 40 μg
18:00nm4.353.24
2:00nm4.593.01
Day 318:00nm4.922.93LT4 2200 μg and T3 40 μg
2:00nm4.382.87
Day 48:00nm6.382.86LT4 3200 μg and T3 40 μg
18:00nm5.733.29
2:00nm5.783.55
Day 58:00nm5.962.93LT4 3200 μg and T3 40 μg
Day 68:00nm6.643.9LT4 3200 μg and T3 40 μg
Day 78:00nm6.963.62LT4 3200 μg and T3 40 μg
Day 158:00nm6.623.81LT4 1700 μg and T3 40 μg
Day 248:00> 755.534.19LT4 3000 μg
  1. *nm = not measured