Does a Large (>24 mm) Follicle Yield a Competent Oocyte/Embryo?

Raoul Orvieto, Aya Mohr-Sasson, Shlomit Blumenfeld, Ravit Nahum, Adva Aizer, Jigal Haas

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Aim: To evaluate the effect of large follicular size (≥24 mm) at day of oocyte retrieval on oocyte/embryo quality. Patients and Methods: A cohort study was conducted in a single tertiary medical center between July 2018 and May 2019. Before ultrasound-guided follicular aspiration, follicles were measured and divided into 2 groups according to their maximal dimensional size: large: ≥24 mm and normal: <24 mm. Microscopic examination of the follicular aspirates was performed by an embryologist. Each follicle aspirated was evaluated for oocyte maturation, oocyte fertilization, and embryo quality. Results: 428 follicles were measured, including 383 (62.81%) in the normal and 45 (14.06%) in the large follicle groups. Oocytes were achieved during aspiration from 297 (75.5%) and 29 (64.4%) of the normal and large follicle groups, respectively (p = 0.05). No in-between group differences were observed in mature oocyte (MII), fertilization, and top-quality embryo (TQE) rates. Nevertheless, once a zygote (2PN) was achieved, a trend toward a higher TQE rate/2PN was found in the large follicle group (16/19 [84.2%] vs. 115/171 [67.3%]; p = 0.062). Conclusion: While a nonsignificant decrease in oocyte recovery rate was found in follicles ≥24 mm, the zygote and TQE per follicle were comparable.

Original languageEnglish
Pages (from-to)416-419
Number of pages4
JournalGynecologic and Obstetric Investigation
Issue number5
StatePublished - 1 Dec 2020
Externally publishedYes


  • Follicle size
  • Oocyte maturation

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology


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