Mosaic embryo transfer explained

Embryo testing samples a small number of cells from the outer layer of an embryo. A mosaic report means the sampled cells did not all show the same chromosome result. The report may describe the result as lower- or higher-level mosaic, and may identify particular chromosomes; these details affect counselling. The sample does not represent every cell in the embryo, so the result is not a complete prediction of development or a child’s health. Laboratories may use different reporting categories. A reproductive genetic counsellor and fertility specialist can explain the report, alternatives, and the limits of the test.

Ask for the complete laboratory report and confirm which test was used. Discuss whether unaffected embryos are available, the order in which embryos would be considered, and what prenatal testing would be offered if pregnancy occurs. Ask how the clinic handles consent, storage, and follow-up. If transfer is chosen, follow the medication and appointment plan, including prescribed progesterone support. Keep written questions because the chromosome terminology can be difficult to remember during a consultation.

Contact the fertility team for heavy bleeding, severe or worsening pelvic pain, fever, faintness, breathing difficulty, or significant abdominal swelling after treatment. Seek emergency help for collapse, severe pain, or trouble breathing. After a positive test, promptly report pain or bleeding so the pregnancy can be assessed. Do not interpret a home test or symptoms as proof that an embryo is developing normally.

Ask what type of mosaicism was reported, how confident the laboratory is in the result, what alternatives exist, and what pregnancy testing would be advised. Ask for a referral to genetic counselling if the terminology or choices remain unclear.