Evaluation of five commercially available assays and measurement of serum total protein concentration via refractometry for the diagnosis of failure of passive transfer of immunity in foals

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Correction: In “Evaluation of five commercially available assays and measurement of serum total protein concentration via refractometry for the diagnosis of failure of passive transfer of immunity in foals,” published November 15, 2005 (J Am Vet Med Assoc 2005;227:1640–1645), the comparisons in Table 6 were incorrect. The table with the corrected comparisons is reprinted below.

Table 6—

Summary statistics (mg/dL) of the differences between the reference method* and a handheld quantitative colorimetric immunoassayh (assay H) or the difference between 2 radial immunodiffusiona,b assays (assays A and B) at serum IgG concentrations <400 mg/dL, 400 to <800 mg/dL, and 800 mg/dL.

ComparisonsIgG (mg/dL)Mean bias (±SD)Limits of agreements
Reference method – assay H< 40046.7 ± 97a−143 to 237
400–800256 ± 233b−199 to 712
>800385 ± 378b−354 to 1,126
Assay B – assay A<40072.7 ± 91.2a−101 to 251
400–800−136.7 ± 239b−605 to 332
>800−61.5 ± 748b−1,528 to 1,405

For each sample, the average of IgG concentrations obtained from the 2 radial immunodiffusion assaysa,b (assays A and B) was used as the reference method to which the other assay results were compared.

Within a comparison, mean bias values with different superscript letters are significantly (P ≤ 0.01) different.

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