1. During the fertile period, cervicalmucus is thin and watery to allow sperm easier access to the oviducts
2. After ovulation, the mucus increase in viscosity (due to progesterone), showing the infertile period is resumed
LH surge
Luteinizing hormone surge
Temperature rise
1. After the LH surge triggers ovulation, the women’s body temperature rises by about 0.5 ̊C due to progesterone action and the temperature remains elevated for the duration of the luteal phase
2. After the 3rd day of elevated temperatures, the infertile period is resumed and the unfertilised ovum disintegrates
Progesterone
A hormone that raises the body temperature
Luteal phase
The phase of the menstrual cycle after ovulation
Calculation of female fertile period
1. Temperature rise
2. Thin, Watery CervicalMucus
Infertility in Females
• Estimate 30-40% of Scots have fertility problems