The Marquette Model method uses the Clearblue Fertility Monitor along with test strips for women to measure the hormone levels in their urine and identify the beginning and end of their fertile window during each menstrual cycle. The method can also be used in conjunction with observing cervical mucus and tracking basal body temperature if needed. This method can be used in a variety of situations, including postpartum, breastfeeding, perimenopause, and women with PCOS and other hormonal imbalances.