Is what is meant by "discrimination" when menstrual bleeding is disordered the discrimination of the blood's color to determine the end of the menstruation period?

A woman refers to her regular menstrual cycle, and if she does not have a regular cycle, she relies on distinguishing the blood. If the days of menstruation increase but do not exceed 15 days, then this entire period is considered menstruation. However, if a woman experiences istiḥāḍah (sees blood outside her menstrual period), she refers to her regular cycle, and if she does not have a regular cycle, she relies on distinguishing the blood. The characteristics distinguishing menstrual blood are: it is dark, has an odor, is accompanied by pain, and is thick, whereas istiḥāḍah blood is: light red, has no odor, is not accompanied by pain, and is thin.