MODEL RELEASED. Embryo selection. Technician at an in vitro fertilisation (IVF) clinic examining embryos under a microscope. The embryos have been produced by fertilising harvested eggs with sperm cells in a laboratory. The technician selects the healthy embryos, which will then either be transferred to the patient's womb (uterus), or frozen for future use. IVF enables couples with a wide range of fertility problems to conceive a child.