System and method for estimating a basal body temperature and forming an indication of ovulation

A system for determining a basal body temperature of an animal or human, the system comprising:

• a data logger device comprising:
• a first temperature sensor for measuring a first body temperature;
• a data store;
• control logic configured to store representations of first body temperature measurements at the data store as a first physiological data set;
• and
• a transmitter operable to transmit at least some of the first physiological data set;
• a data reader device comprising a receiver operable to receive at least some of the first physiological data set from the data logger device;
• and
• a data processor arranged to access the first physiological data set and to extrapolate a decrease in first body temperature indicated during a sleep period so as to estimate a basal body temperature of the user representative of a minimum body temperature.

A method for determining a point of ovulation in a female, the method comprising:

• storing at a data store as a first physiological data set representations of first body temperature measurements of the female measured by a first temperature sensor;
• accessing by a data reader device at least some of the first physiological data set stored in said data store;
• estimating, using a data processor associated with said data reader device, a basal body temperature of the female from the accessed first physiological data set by extrapolating a decrease in first body temperature indicated during a sleep period so as to estimate a basal body temperature of the user representative of a minimum body temperature;
• and
• forming an indication of the point of ovulation from said estimated basal body temperature.