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What is a coverline and how does OvaGraph determine where to draw it?
When interpreting BBT charts, we often look for a so-called 'biphasic' pattern. A typical BBT chart will have two distinct phases ('biphasic'), showing relatively low temperatures before ovulation and slightly higher temperatures after ovulation. These phases are seperated by the temperature rise that occurs just after ovulation takes place.
The temperature shift that follows ovulation can be very small, and it can be difficult to identify this biphasic pattern. As a result, drawing a ‘coverline’ on your chart can be a helpful way to separate the two phases of your chart and help you determine if your temperatures are, in fact, staying elevated. OvaGraph will automatically draw a cover line once a possible shift has been detected. The coverline will be drawn 0.1 degrees Fahrenheit above the highest of the previous six temperatures before the possible shift.
It is important to keep in mind that the coverline is only a visual tool intended to help with chart interpration and has no physiological meaning. Many different factors can cause temperature fluctuations and a temperature that falls below the coverline does not necessarily indicate anything significant. Please use the coverline as a guide, and keep in mind that as long as you are able to detect a general biphasic pattern in your chart, you need not worry about one or two temperatures that drop below the coverline.
Question Topic:
BBT Charting