Metaphase I oocyte maturation arrest

What it means

Failure of oocytes to proceed through the stages of meiosis with stoppage at the first metaphase stage.

An essential feature of successful mammalian reproduction is the fusion of a sperm with a metaphase II oocyte. Oocytes are first arrested at prophase I and resume meiosis in response to luteinizing hormone (LH). Following spindle assembly and extrusion of the first polar body, oocytes are again arrested at metaphase II until fertilization.Failure of oocytes to progress beyond metaphase I of meiosis.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Metaphase I oocyte meiotic arrest · Oocyte arrest at metaphase I · Oocyte meiotic arrest at metaphase I