Menstrual Glossary A to Z


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.

Disclaimer: All information provided in this glossary is for educational purposes only. It is not intended as a substitute for advice provided by a medical doctor or qualified healthcare provider. You should not use this information for self-diagnosis or for treating a health problem or disease. If you have any questions whatsoever about your medical health or believe you have a medical problem or disease, you should contact your medical doctor or healthcare provider. You should never disregard medical advice or delay seeking medical advice or treatment because of something you have read in this glossary. No guarantee is made about the accuracy, completeness, or relevance of the information contained herein.