Our Laboratory

As a patient at Colorado Reproductive Endocrinology, you will not only receive world-class care from expert doctors, but also peace of mind from working with a highly specialized fertility lab.


Laboratory services offered by Colorado Reproductive Endocrinology include sperm preparation for donor insemination, intrauterine insemination (IUI), and semen cryopreservation. The CRE lab team also provides for embryo and egg cryopreservation (freezing) if needed.

Genetic Testing

Before starting the process of intrauterine insemination or in vitro fertilization (IVF), many patients opt for laboratory genetic testing. These tests can be used to screen both parents for more than 100 diseases, including fragile X syndrome, cystic fibrosis, and sickle cell.

At CRE, we can also arrange for preimplantation genetic diagnosis (PGD) testing. Using this technique, a single cell is removed from an embryo and checked for any abnormalities before the embryo is implanted in the uterus.

The laboratory analysis results allow our physicians to recommend the best course of fertility treatment for our patients.

Advanced Techniques

To increase your chances of a successful pregnancy, our laboratory also offers advanced assisted reproductive techniques such as laser assisted hatching and intracytoplasmic sperm injection (ICSI). Assisted hatching softens the “shell” around the ooctye, or egg, to improve the odds of successful implantation.


Jonathan Van Blerkom, Ph.D.

Laboratory Director

Dr. Van Blerkom performed Colorado’s first successful in vitro fertilization procedure in 1982. A professor of molecular, cellular and developmental biology at the University of Colorado in Boulder, he is recognized throughout the world as a preeminent expert on egg and sperm physiology. He has lectured extensively throughout North America, Europe, and Australia. He also serves on the editorial board of several international publications and has written numerous articles and books. Soon after Dr. Van Blerkom started his IVF lab, U.S. News and World Report listed Dr. Van Blerkom’s IVF lab among the nation’s top 10 laboratories dealing with advanced reproductive technologies. In 2013, Dr. Van Blerkom was named Embryologist of the Year by the American College of Embryology.
See Dr. Van Blerkom’s curriculum vitae here.