Skip to main content
Fig. 2 | Thyroid Research

Fig. 2

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

Fig. 2

Compatibility of FT4 (A) or FT3 (B) concentrations measured through thyroid function tests with reference ranges in patients with normal serum TSH concentrations. Among 250 patients, 43 had them within the normal range (0.5–5.0 μIU/mL). The reference range for each thyroid hormone is indicated by the square area. Among 43 patients, 25 patients (58.1%) had FT4 concentrations within the reference range (0.9–1.7 ng/dL) and 18 (41.9%) had FT4 concentrations above the reference range. However, none of them had serum FT4 concentrations below the reference range. On the other hand, 11 patients (25.6%) had FT3 concentrations below the reference range (2.3–4.0 pg/mL) and one patient (2.3%) had FT3 concentrations above the reference range; hence, 31 patients (72.1%) had concentrations within the reference range. FT4, free thyroxine; FT3, free triiodothyronine

Back to article page