What is BBT Charting?

Basal Body Temperature charting gives us a window into the ebb and flow of hormones during your menstrual cycle.  By regulating this ebb and flow, we feel we maximize your fertility.  The basal body temperature is taken first thing in the morning upon waking and before you get out of bed.  You should use a thermometer made for basal body temps.  Pick a baseline time for taking you temps, i.e. the most common time you wake, and adjust your temperature .1 degree for each half hour variation in the time you take your temp.  Temps should be raised .1 degree for each half hour earlier then your baseline time and lowered .1 degree for each half hour later than you baseline temp.  Plot your temps each day manually by printing out a blank chart:

Blank BBT Chart

Or use an online service like:


In a perfectly regulated cycle, temperatures should be lower in the first half of the cycle (the follicular phase), should spike or rise at ovulation around day 14, and stay higher for the entire second half of your cycle (the luteal phase).  Don’t worry if yours does not look like this.  Our job is to work on regulating your chart.  If charting makes you too anxious or feel overly vigilant, let us know and we can use other methods to help us monitor treatment.