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Performance Evaluation of the Serum Thyroglobulin Assays With Immunochemiluminometric Assay and Immunoradiometric Assay for Differentiated Thyroid Cancer

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ABSTRACT

Background: Measurement of postoperative serum thyroglobulin (Tg) is important for detecting persistent or recurrent differentiated thyroid cancer. We evaluated the analytic performance of the DxI 800 assay (Beckman Coulter, USA) for serum Tg and anti-thyroglobulin antibodies (TgAbs) in comparison with that of the GAMMA-10 assay (Shinjin Medics Inc., Korea) for serum Tg and RIA-MAT 280 assay (Stratec, Germany) for TgAb.

Methods: We prospectively collected blood samples from 99 patients thyroidectomized for thyroid cancer. The functional sensitivity was investigated in standards and human serum. Precision and linearity were evaluated according to the guidelines of the Clinical and Laboratory Standards Institute. The correlation between the two assays was assessed in samples with different Tg ranges.

Results: The functional sensitivity of the DxI 800 assay for serum Tg was between 0.0313 and 0.0625 ng/mL. The total CV was 3.9–5.6% for serum Tg and 5.3–6.9% for serum TgAb. The coefficient of determination (R2) was 1.0 and 0.99 for serum Tg and TgAb, respectively. The cut-offs for serum TgAb were 4.0 IU/mL (DxI 800) and 60.0 IU/mL (RIA-MAT 280), and the overall agreement was 68.7%. The correlation between the two assays was excellent; the correlation coefficient was 0.99 and 0.88 for serum Tg and TgAb, respectively.

Conclusions: The DxI 800 is a sensitive assay for serum Tg and TgAb, and the results correlated well with those from the immunoradiometric assays (IRMA). This assay has several advantages over the IRMA and could be considered an alternative test for Tg measurement.

No MeSH data available.


Correlation of serum thyroglobulin (A) and anti-thyroglobulin antibody (B) concentrations measured by the two assays (results within analytical measurement ranges).
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Figure 2: Correlation of serum thyroglobulin (A) and anti-thyroglobulin antibody (B) concentrations measured by the two assays (results within analytical measurement ranges).

Mentions: Some samples exceeded the AMR range of DxI 800. Three samples exceeded 500 ng/mL for Tg, and one sample exceeded 2,500 IU/mL for TgAb. Correlation between each method was evaluated after excluding these results. R was 0.99 and 0.88 for serum Tg and TgAb, respectively. The equation were DxI 800=0.68×GAMMA-10+0.89 (serum Tg) and DxI 800=0.29×RIA-MAT 280+13.93 (serum TgAb) (Fig. 2).


Performance Evaluation of the Serum Thyroglobulin Assays With Immunochemiluminometric Assay and Immunoradiometric Assay for Differentiated Thyroid Cancer
Correlation of serum thyroglobulin (A) and anti-thyroglobulin antibody (B) concentrations measured by the two assays (results within analytical measurement ranges).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940483&req=5

Figure 2: Correlation of serum thyroglobulin (A) and anti-thyroglobulin antibody (B) concentrations measured by the two assays (results within analytical measurement ranges).
Mentions: Some samples exceeded the AMR range of DxI 800. Three samples exceeded 500 ng/mL for Tg, and one sample exceeded 2,500 IU/mL for TgAb. Correlation between each method was evaluated after excluding these results. R was 0.99 and 0.88 for serum Tg and TgAb, respectively. The equation were DxI 800=0.68×GAMMA-10+0.89 (serum Tg) and DxI 800=0.29×RIA-MAT 280+13.93 (serum TgAb) (Fig. 2).

View Article: PubMed Central - PubMed

ABSTRACT

Background: Measurement of postoperative serum thyroglobulin (Tg) is important for detecting persistent or recurrent differentiated thyroid cancer. We evaluated the analytic performance of the DxI 800 assay (Beckman Coulter, USA) for serum Tg and anti-thyroglobulin antibodies (TgAbs) in comparison with that of the GAMMA-10 assay (Shinjin Medics Inc., Korea) for serum Tg and RIA-MAT 280 assay (Stratec, Germany) for TgAb.

Methods: We prospectively collected blood samples from 99 patients thyroidectomized for thyroid cancer. The functional sensitivity was investigated in standards and human serum. Precision and linearity were evaluated according to the guidelines of the Clinical and Laboratory Standards Institute. The correlation between the two assays was assessed in samples with different Tg ranges.

Results: The functional sensitivity of the DxI 800 assay for serum Tg was between 0.0313 and 0.0625 ng/mL. The total CV was 3.9–5.6% for serum Tg and 5.3–6.9% for serum TgAb. The coefficient of determination (R2) was 1.0 and 0.99 for serum Tg and TgAb, respectively. The cut-offs for serum TgAb were 4.0 IU/mL (DxI 800) and 60.0 IU/mL (RIA-MAT 280), and the overall agreement was 68.7%. The correlation between the two assays was excellent; the correlation coefficient was 0.99 and 0.88 for serum Tg and TgAb, respectively.

Conclusions: The DxI 800 is a sensitive assay for serum Tg and TgAb, and the results correlated well with those from the immunoradiometric assays (IRMA). This assay has several advantages over the IRMA and could be considered an alternative test for Tg measurement.

No MeSH data available.