How should a menstrual cycle be accurately measured and calculated?
Answer
From the first day of bleeding in one period to the first day of the next
The correct method for calculating the length of a menstrual cycle is to count from the first day of bleeding in one cycle to the first day of bleeding in the following cycle. This measurement encompasses the entire physiological process of the cycle. Tracking this interval consistently allows for an accurate determination of whether the cycle falls within the healthy 21-to-35-day window or if it indicates an irregularity.
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