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Fertility Glossary

Aneuploidy

An abnormal number of chromosomes.

Aneuploidy is the commonest reason an embryo fails to implant or a pregnancy miscarries, and it becomes more frequent with the age of the eggs.

Related terms

Euploid embryo

An embryo with the expected number of chromosomes on testing.

Miscarriage

The loss of a pregnancy before 24 weeks.

PGT-A

Testing embryos for the wrong number of chromosomes.

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