Dr. Tamar Goldwaser returns to Healthful Woman for episode two of the Prenatal Genetics miniseries. She discusses aneuploidy screening, a test to check for the number of chromosomes present and whether a person has more or fewer than the expected 46 chromosomes. This can indicate a number of genetic conditions, and Dr. Goldwaser discusses the pre-test counseling that she performs with patients to understand why they want to have the tests and what their plans might be in the event of an abnormal result.