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Table 2 1000 μg L-T4 test in Patient I

From: A single bolus of high dose levothyroxine (L-T4) as a test in cases of suspected poor compliance to L-T4 therapy

Date TSH (μIU/ml) Reference range (μIU/ml) FT4 (ng/dl) Reference range (ng/dl) FT3 (pg/ml) Reference range (pg/ml)
Day 0a 18.92 0.27–4.2 1.54 0.93–1.7 3.06 2.6–4.4
Day 1 8.79 0.27–4.2 4.32 0.93–1.7 4.69 2.6–4.4
Day 2 6.87 0.27–4.2 3.36 0.93–1.7 4.69 2.6–4.4
Day 3 2.34 0.27–4.2 2.58 0.93–1.7 4.26 2.6–4.4
Day 4 1.40 0.27–4.2 2.22 0.93–1.7 3.84 2.6–4.4
Day 5 1.16 0.27–4.2 1.82 0.93–1.7 4.93 2.6–4.4
Day 6 2.76 0.27–4.2 1.65 0.93–1.7 3.45 2.6–4.4
  1. areceived 1000 μg of L-T4 (Euthyrox N®) as a single fasting dose