Do All Follicles Have Eggs?

Follicle Tracking Scans

They range in size from 4 mm – 25 mm; and the eggs grow within these follicles. However, not all follicles contain eggs, which is why the correlation between the numbers of follicles seen on the IVF ultrasound scans and the number of eggs, which are actually retrieved is not perfect.

How often is there no egg in a follicle?

Generally speaking the number of eggs expected from follicles seen on ultrasound scan is approximately 80-90%. It is important to remember that there will never be more than one egg per follicle.

Is it possible to have follicles without eggs?

Empty follicle syndrome (EFS), although rare, is a disappointing condition in which no oocytes are retrieved from mature follicle after ovulation induction in in vitro fertilization (IVF) cycles.