| | Conditions & Treatments | Infertility Which is the best definition of miscarriage? Miscarriage is defined as the loss of a pregnancy before 24 weeks of gestation, or the loss of a fetus weighing less than 500 grams. Infertility - Related Articles Can a pituitary growth cause infertility? Is it normal to have cramping before frozen embryo transfer? What are extensors? Im a twin could you have twins? How Are the Quaid Twins Doing? What is a reproductive physiologist? Does touching the tip of a home pregnancy test with your finger defect it?