Genetic testing of embryos, also known as preimplantation genetic testing (PGT), is recommended in fertility treatments in the following situations:

1. Genetic Disorders: If one or both partners carry a known genetic disorder that could be passed on to their offspring, genetic testing of embryos is recommended to avoid transmitting the genetic condition to the child.

2. Chromosomal Abnormalities: Couples who have a history of recurrent pregnancy loss or multiple failed IVF attempts may benefit from PGT to screen for chromosomal abnormalities in the embryos, which could be a contributing factor to the unsuccessful pregnancies.

3. Advanced Maternal Age: Women over the age of 35 are at increased risk of producing embryos with chromosomal abnormalities, such as Down syndrome. PGT can help identify chromosomally normal embryos for transfer, increasing the chances of a successful pregnancy.

4. Repeated IVF Failures: In cases where multiple IVF cycles have resulted in implantation failures or miscarriages, PGT can identify embryos with the highest potential for successful implantation, thus improving the chances of a viable pregnancy.

5. Family History of Genetic Conditions: If there is a family history of genetic conditions or hereditary diseases, genetic testing of embryos can help identify unaffected embryos for transfer, reducing the risk of passing on the condition to the child.

By conducting genetic testing of embryos in these situations, fertility clinics can help increase the likelihood of a successful pregnancy and reduce the risk of genetic disorders