Why this sequence matters
Clinical and operational context
In the clinic: In preimplantation genetic testing (PGT), clinical decisions about which blastocyst to warm and transfer depend completely on chain-of-custody accuracy between the embryology dish, the trophectoderm biopsy tube, the outside reference genetics report, and the liquid-nitrogen storage cane.
Across handoffs: Genetic testing records frequently change over several weeks: an outside reference lab may place an accession hold for a missing form, a blastocyst with an inconclusive first result may be warmed and biopsied a second time, or a genetics lab may issue an amended report. Tracking version history and parent-embryo lineage prevents transferring on outdated or crossed data.





