Purpose To investigate the stability and repeatability of electrochemiluminescence immunoassay (ECLIA) for betahCG detection in embryo spent culture media. To evaluate the correlation between the viability of preimplantation embryo and beta-hCG profile by the new assay. Methods In a retrospective study, a total of 357 spent culture media from day1 to day5 were individually collected and quantified by ECLIA. The blank controls and reliability test were performed with normal saline/pure culture media. Results 1) There was no detectable amount of beta-hCG in blank controls. A high degree of linearity (R 2 =0.995) was found in this study; intra-assay and inter-assay coefficient of variation were 4.87 % and 6.25 %. 2) A significantly higher concentration of beta-hCG was found at day5 group than it at day3 group, both in total samples (1.47±0.68mIU/ml vs 0.55±0.32mIU/ml) and in homologous embryo samples (1.43±0.91mIU/ml vs 0.52±0.23mIU/ml). 3) There was a positive correlation between beta-hCG concentration and implantation rate (r=0.559 at day3 and 0.535 at day5) or blastocyst morphological grading (r=0.411).Conclusions ECLIA may be an optimal choice for detecting beta-hCG in spent culture media to assess embryo viability, indicating secreted beta-hCG as a useful biomarker for embryo selection in IVF-ET procedure.
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