Amenorrhea classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Classification
Amenorrhea is broadly classified as primary and secondary.
- Primary amenorrhea there is absence of menarche by the age of 16. Menstruation cycles never begin. There will be a delay of menses one year beyond the family history of first menses.
- Secondary amenorrhea is defined as absence of menses in a woman who had previously menstruated for at least 3 cycles or 6 months. Secondary amenorrhea is more common than primary amenorrhea.
The other type of classification based on the levels of gonadotropic hormones includes:
- Hypogonadotropic amenorrhoea refers to conditions where there are very low levels of serum FSH and LH.
- Normogonadotropic amenorrhoea - FSH levels are in the normal range.