What Is PGT-A?

PGT-A (preimplantation genetic testing for aneuploidy) is a laboratory procedure used during IVF to screen embryos for chromosomal abnormalities before transfer. It involves biopsying cells from the trophectoderm of a blastocyst-stage embryo.

Clinical significance

PGT-A identifies embryos with the correct number of chromosomes (euploid), which have a significantly higher probability of implantation and live birth. It does not cause attrition: it reveals it by identifying embryos that would have failed to implant or miscarried.

Common confusion

PGT-A is sometimes confused with PGT-M (which tests for specific genetic diseases) or PGT-SR (which tests for structural chromosomal rearrangements). PGT-A screens only for whole-chromosome gains or losses.

Related reference

/glossary/pgta →/glossary/euploid-embryo →/glossary/aneuploid-embryo →/glossary/embryo-biopsy →/glossary/mosaic-embryo →← Back to Glossary Index

Used in

PGT-A (Full Entry) →Euploid Embryo →What Does PGT-A Test For? →

This content defines terminology for educational orientation. It does not constitute medical advice.

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