Published by INCITA Clinic
On this page
Parent and embryo reports examine different material
A normal chromosome result in both parents does not mean that every embryo will have the same chromosome findings. Errors can occur during the formation of eggs or sperm, fertilization or subsequent cell division.
Parental chromosome analysis and testing of embryo biopsy material therefore answer different questions. A parental report is important background information, but it is not a result for each embryo formed in treatment.
What aneuploidy means
Aneuploidy refers to an abnormal chromosome number, such as an extra or missing chromosome. The typical human chromosome complement is 23 pairs. Chromosome-number changes can affect embryo development and may be associated with implantation failure or pregnancy loss.
These findings are not explained by an embryo’s appearance alone. The grade recorded during culture and a genetic laboratory result are separate parts of the treatment record.
Why age is discussed
Age is relevant when the team considers the likelihood of chromosome-number findings and reviews treatment options. It does not identify the result of an individual embryo in advance.
Ovarian reserve and embryo chromosome findings also should not be treated as the same measurement. AMH and antral follicle count help assess ovarian reserve; they do not count chromosomes in an embryo. The consultation brings these findings together with reproductive history and earlier treatment.
Where PGT-A fits
PGT-A examines chromosome-number findings in embryo biopsy material as part of a planned IVF pathway. The discussion includes the clinical question, embryo development and how the results will be used in transfer planning.
A known single-gene condition is a different question, addressed through PGT-M. A structural chromosome rearrangement may lead to a PGT-SR discussion. The full family and laboratory reports are more useful than a general request for “the most complete screening.”
Compare the different PGT approaches.
Useful questions for the consultation
- What do the parental chromosome or genetic reports show?
- Were there earlier pregnancies, losses or embryo-test results to review?
- Which genetic question is being discussed in this cycle?
- How will embryo development, grading and genetic findings be considered together?
- What can the proposed test report, and which later clinical decisions remain?
Read about ovarian reserve, PGT-A and understanding an IVF laboratory record.