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Oogenesis

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

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Related Experiment Video

Updated: Jun 6, 2026

OP-IVM: Combining In vitro Maturation after Oocyte Retrieval with Gynecological Surgery

OP-IVM: Combining In vitro Maturation after Oocyte Retrieval with Gynecological Surgery

Published on: May 9, 2021

Is routine screening needed for coagulation abnormalities before oocyte retrieval?

Ariel Revel¹, Yael Schejter-Dinur, Shlomi Z Yahalomi

¹Department of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel. arielr2@hadassah.org.il

Fertility and Sterility

|November 12, 2010

Summary

This summary is machine-generated.

Routine coagulation screening before oocyte retrieval in in vitro fertilization (IVF) is not highly effective. Many tests are needed to prevent a single bleeding event, questioning the utility of this common practice.

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OP-IVM: Combining In vitro Maturation after Oocyte Retrieval with Gynecological Surgery

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The Immediate Partial Removal of Cumulus-Oocyte Complexes: A Refined Approach for Rapid Observation of In Vitro Fertilization

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Published on: October 18, 2024

Area of Science:

Reproductive Medicine
Hematology

Background:

Coagulation screening is often performed before invasive procedures.
Its necessity before oocyte retrieval in IVF is debated.

Purpose of the Study:

To evaluate the clinical utility of pre-procedure coagulation screening.
To determine the effectiveness in preventing bleeding events during oocyte retrieval in IVF.

Main Methods:

A cross-sectional retrospective study design.
Analysis of 1,032 patient records undergoing IVF.
Assessment of coagulation test results and procedure-related bleeding.

Main Results:

A low yield of abnormal coagulation tests was observed.
534 coagulation tests were required to identify one case of bleeding.
The screening's ability to prevent bleeding was found to be limited.

Conclusions:

Routine coagulation screening before oocyte retrieval in IVF has low utility.
The findings suggest reconsidering current guidelines for coagulation testing in this context.