Coverline is a term used in BBT charting. A line drawn on a fertility graph that represents a measurable shift in the ovulatory cycle from the follicular phase to the luteal phase (with ovulation occurring in between.) Once 6 days of temperatures have been noted on a graph, the first BBT that is charted at .2 (two-tenths) degree higher is considered a 'thermal shift'. The coverline is then drawn one-tenth degree over the previous six temps. If following temps are above the coverline for at least three days, ovulation is assumed to have taken place.
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