Effect of multiple freeze-thaw cycles on the stability of positive anti-treponemal serum samples
ABSTRACT Introduction: Biological samples have long been used in multiple laboratory investigations, and this procedure has been an issue of concern, as the samples are submitted to repeated freeze-thaw cycles, which may affect the results of a particular immunodiagnostic assay, due to the occurrenc...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Brasil |
| Institución: | Sociedade Brasileira de Patologia (SBP) |
| Repositorio: | Jornal Brasileiro de Patologia e Medicina Laboratorial (Online) |
| Idioma: | inglés |
| OAI Identifier: | oai:scielo:S1676-24442017000400246 |
| Acceso en línea: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1676-24442017000400246 |
| Access Level: | acceso abierto |
| Palabra clave: | serum antibodies Treponema pallidum quality control reactivity-stability |
| Sumario: | ABSTRACT Introduction: Biological samples have long been used in multiple laboratory investigations, and this procedure has been an issue of concern, as the samples are submitted to repeated freeze-thaw cycles, which may affect the results of a particular immunodiagnostic assay, due to the occurrence of physical damage to the antibody of interest. Objective: This study aimed at investigating the impact of successive freeze-thaw cycles on the stability of serum samples stored at -20ºC regarding the reactivity of anti-treponemal antibodies. Methods: At the Immunology Center-Instituto Adolfo Lutz (IAL), the analyzed serum samples analyzed were prepared and established as reference material for anti-treponemal immunodiagnostic assays. Sera stability was evaluated by chemiluminescence assay in samples submitted to 25 successive freeze-thaw cycles, ranging from 6 to 174 cycles. Results: Neither statistically significant effect on the reactivity of anti-treponemal antibodies (p-value > 0.05), nor adverse effect were observed in weakly reactive samples, such as the occurrence of false-negative results. Conclusion: It was shown that 174 freeze-thaw cycles of anti-treponemal sera did not affect the stability and the quality of samples, when evaluated by chemiluminescence assay. |
|---|