What it means

Egg maturity refers to whether an egg has developed enough to be ready for fertilisation. Not all eggs collected during retrieval are mature, and only mature eggs can be used for the next step.

When it’s used

It’s discussed after egg retrieval, when the lab checks how many of the collected eggs are mature and suitable for fertilisation.

Why people get confused

Many people expect the number of eggs retrieved to match the number used for fertilisation. But some eggs may still be immature, so the number usually drops at this stage.

Think of it this way

Egg retrieval collects all available eggs, but maturity determines which ones are actually ready to move forward.

What to expect

After retrieval, you may hear two numbers: total eggs collected and how many are mature. This difference is normal, and it’s one of the early stages where numbers begin to change.