How Many Oocytes Should I Freeze?

Our hospital calculated the number of frozen oocytes required to give birth to one child from statistics for each age. The birth rate (%) for each number of thawed oocytes is as follows.

  10 oocytes 20 oocytes 30 oocytes 40 oocytes
32years old 65.5% 88.1% 95.9% 98.6%
38years old 51.1% 76.1% 88.3% 94.3%
42years old 42% 66.3% 80.5% 88.7%

This table is based on Cil AP, Bang H, Oktay K. Age-specific probability of live birth with oocyte cryopreservation: an individual patient data meta-analysis. Fertil Steril. 2013; 100 (2): 492-499. This research originates with the Oak Clinic Group.

Many patients try to freeze as many oocytes as possible, hopefully this guide can help to build confidence.