• Yanhe Liu, Vincent Chapple, Katie Feenan, Peter Roberts, and Phillip Matson.
• Fertility North, Joondalup Private Hospital, Joondalup, Western Australia, Australia; School of Medical Sciences, Edith Cowan University, Joondalup, Western Australia, Australia. Electronic address: yanhe.liu@fertilitynorth.com.au.
• Fertil. Steril. 2016 Mar 1; 105 (3): 656-662.e1.

ObjectiveTo present a time-lapse deselection model involving both qualitative and quantitative parameters for assessing embryos on day 3.DesignRetrospective cohort study and prospective validation.SettingPrivate IVF center.Patient(S)A total of 270 embryos with known implantation data (KID) after day 3 transfer from 212 IVF/intracytoplasmic sperm injection (ICSI) cycles were retrospectively analyzed for building the proposed deselection model, followed by prospective validation using an additional 66 KID embryos.Intervention(S)None.Main Outcome Measure(S)Morphological score on day 3, embryo morphokinetic parameters, abnormal cleavage patterns, and known implantation results.Result(S)All included embryos were categorized either retrospectively or prospectively into 7 grades (A+, A, B, C, D, E, F). Qualitative deselection parameters included poor conventional day 3 morphology, abnormal cleavage patterns identified via time-lapse monitoring, and <8 cells at 68 hours postinsemination. Quantitative parameters included time from pronuclear fading (PNF) to 5-cell stage and duration of 3-cell stage. KID implantation rates of embryos graded from A+ to F were 52.9%, 36.1%, 25.0%, 13.8%, 15.6%, 3.1%, and 0 respectively (area under the curve [AUC] = 0.762; 95% confidence interval [CI], 0.701-0.824), and a similar pattern was seen in either IVF (AUC = 0.721; 95% CI, 0.622-0.821) or ICSI embryos (AUC = 0.790; 95% CI, 0.711-0.868). Preliminary prospective validation using 66 KID embryos also showed statistically significant prediction in Medicult (AUC = 0.750; 95% CI, 0.588-0.912) and Vitrolife G-Series (AUC = 0.820; 95% CI, 0.671-0.969) suites of culture media.Conclusion(S)The proposed model involving both qualitative and quantitative deselection effectively predicts day 3 embryo implantation potential and is applicable to all IVF embryos regardless of insemination method by using PNF as the reference starting time point.Copyright © 2016 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.

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