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Fig. 1 | Thyroid Research

Fig. 1

From: Proportion of serum thyroid hormone concentrations within the reference ranges in athyreotic patients on levothyroxine monotherapy: a retrospective study

Fig. 1

Compatibility of FT4 (A) or FT3 (B) concentrations measured through thyroid function tests with reference ranges in patients with suppressive serum TSH concentrations. Among 250 patients, 207 had serum TSH concentrations below the reference range (0.5–5.0 μIU/mL). The reference range for each thyroid hormone is indicated by the square area. Among 207 patients, 61 patients (29.5%) had FT4 concentrations within the reference range (0.9–1.7 ng/dL) and 146 (70.5%) had FT4 concentrations above the reference range. However, none of them had serum FT4 concentrations below the reference range. On the other hand, 10 patients (4.8%) had FT3 concentrations below the reference range (2.3–4.0 pg/mL) and 8 patients (3.9%) had FT3 concentrations above the reference range; hence, 189 patients (91.3%) had concentrations within the reference range. FT4, free thyroxine; FT3, free triiodothyronine

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Thyroid Research

ISSN: 1756-6614