Thyroid function tests which consisted of serum free T3 (fT3), free T4 (fT4), and TSH levels were performed using electrochemiluminescent immunoassay (Elecsys FT3 II kit, Elecsys FT4 kit, and Elecsys TSH kit, respectively; Roche Diagnostics, Mannheim, Germany); the reference ranges were 2.33–4.00 pg/mL, 0.880–1.620 ng/dL, and 0.500–5.000 μIU/mL, respectively. Levels of anti-thyroperoxidase antibodies (TPOAbs) and anti-thyroglobulin antibodies (TgAbs) were also measured using electrochemiluminescent immunoassay (Elecsys Anti-TPO kit and Elecsys Anti-Tg kit, respectively; Roche Diagnostics). Thyroid uptake of FDG-PET was defined as diffusely increased FDG uptake in the thyroid gland.
Elecsys ft4 kit
Manufactured by Roche
The Elecsys FT4 kit is a laboratory diagnostic test used to measure the level of free thyroxine (FT4) in human serum or plasma samples. FT4 is the biologically active form of the thyroid hormone thyroxine. The kit utilizes an electrochemiluminescence immunoassay (ECLIA) technology to quantitatively determine the FT4 concentration.
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3 protocols using elecsys ft4 kit
1
Thyroid Function and Autoantibody Evaluation
2
Thyroid Function Biomarker Measurement
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Serum levels of free T3 (fT3), free T4 (fT4), and TSH were measured with electrochemiluminescence immunoassays. During the period analyzed in the retrospective study, Elecsys kits were used (Elecsys FT3 II kit, Elecsys FT4 kit, and Elecsys TSH kit; Roche Diagnostics, Mannheim, Germany), and the reference ranges were 2.33-4.00 pg/mL, 0.880-1.620 ng/dL, and 0.500-5.000 μIU/mL, respectively. In the case series, AIA kits were used (AIA-PACK CL FT3 kit, AIA-PACK CL FT4 kit, and AIA-PACK CL TSH kit; Tosoh, Tokyo, Japan), and the reference ranges were 2.06-3.17 pg/mL, 0.880-1.620 ng/dL, and 0.500-5.000 μIU/mL, respectively. TgAb, TPOAb, and anti-TSH receptor antibody (TRAb) were measured using Elecsys kits (Roche Diagnostics), with reference ranges of <28 IU/L, <16 IU/L, and <2.0 IU/L, respectively. Measurement of thyroid stimulating antibody (TSAb) titers was performed using a TSAb enzyme immunoassay kit (Yamasa Corp., Chiba, Japan), with a cut-off level of 120%.
3
Comprehensive Thyroid Function Evaluation
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Serum levels of free T3 (fT3), free T4 (fT4), TSH, and thyroglobulin (Tg) were measured with electrochemiluminescence immunoassays (Elecsys FT3 II kit, Elecsys FT4 kit, Elecsys TSH kit, and Elecsys Tg II kit, respectively; Roche Diagnostics, Mannheim, Germany). The reference ranges were 2.33-4.00 pg/mL, 0.880-1.620 ng/dL, 0.500-5.000 μIU/mL, and <33.7 ng/mL respectively. Anti-thyroid peroxidase antibody (TPOAb), anti-thyroglobulin antibody (TgAb), and anti-TSH receptor antibody (TRAb) were measured using Elecsys kits (Roche Diagnostics). The reference ranges were <16 IU/L, <28 IU/L, and <2.0 IU/L, respectively. Measurement of thyroid stimulating antibody (TSAb) titers was performed using a TSAb enzyme immunoassay kit (Yamasa Corp., Chiba, Japan); the cut-off level was 120%.
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