Embryo biopsy

Around five cells are taken from the trophectoderm on day five or six, and the embryo is frozen while the sample is analysed. Skilled biopsy appears not to reduce success materially, but it is an intervention and is only worthwhile when the test result will change a decision.

Also known as: trophectoderm biopsy, PGT biopsy

Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.