: Menstrual Cycle Pattern Assessment (Ages 18–22; PhenX Measure)

: What This Assessment Is

: This is not a laboratory blood or urine test. It is a standardized set of questions used to describe how regular, frequent, and predictable a person's menstrual periods are. The "PhenX" label refers to a consensus collection of standardized measures used in research to make data comparable across studies.

: Who It Is For

: The measure is designed for young adults in the 18 to 22 age range. It may be used in research studies, health surveys, or clinical settings where a clinician wants a structured picture of someone's menstrual history.

: What Information Is Collected

: Typical questions ask about the age at first period, whether cycles are regular, how many days bleeding usually lasts, the typical length of the cycle, and whether there have been changes or missed periods. Answers are recorded as a pattern description rather than as a single numeric lab value.

: How Results Are Used

: The pattern information helps describe menstrual health over time and can support research or guide a conversation with a clinician. It is not interpreted against a numeric reference range like a chemistry test; instead, it summarizes the reported cycle pattern.