There are various steps in the PGD procedure, which start off with a common IVF or the more advanced ICSI wherein the egg & sperm are fertilized, and embryos produced. Once the fertilization is complete, the embryos are stored for 3 to 5 days. On the 3rd day, one or two of the cells are removed for testing, or the embryologist will wait for the 5th day before extracting 5-6 cells for the purpose of testing. The extracted cells are sent for genetic diagnosis, the results of which typically take about 24 hours.