What Really Happens to Your Embryos in an IVF Lab?

What Really Happens to Your Embryos in an IVF Lab?

Author: Women's Health Melbourne August 16, 2026 Duration: 35:49

What happens to your eggs, sperm and embryos once they enter an IVF laboratory?


In this episode of Knocked Up, Dr Raelia Lew speaks with senior embryologist Alex about the science, precision and human care behind every stage of embryo development.


Alex explains how embryologists care for eggs and embryos from collection through to transfer, freezing and genetic testing. They discuss the strict identification systems used to prevent embryo mix-ups, including double witnessing, barcodes and electronic RFID tracking.


The conversation also explores embryo grading, what grades such as 4AA or 5BB can and cannot tell us, and why even a beautiful-looking embryo may not result in pregnancy.


Raelia and Alex unpack ICSI, sperm-selection techniques, embryo freezing and warming, and the difference between an embryo’s appearance and its chromosomal health. They also look at how artificial intelligence is helping embryologists assess embryos and identify sperm, without replacing human expertise.


It’s a fascinating look behind the laboratory door at the people, technology and safeguards supporting every IVF journey.


In this episode:

  • What an embryologist does during IVF

  • How embryo biopsies are performed

  • How IVF clinics prevent embryo mix-ups

  • What egg and sperm quality can reveal

  • How AI is being used to rank embryos

  • What IVF embryo grades actually mean

  • Whether lower-grade embryos can become healthy babies

  • How safely embryos survive freezing and warming

  • How ICSI works and when it may be recommended

  • Sex selection, ethics and “designer babies”

  • Why a good-quality embryo may fail to implant

  • How IVF success rates are measured


Episode chapters:

00:38 Meet embryologist Alex

02:09 Training as an embryologist

03:08 How embryo biopsies work

04:01 Preventing embryo mix-ups

06:56 The human side of embryology

09:21 Learning from embryo development

10:04 Egg and sperm-selection techniques

12:20 Artificial intelligence in IVF

15:52 Understanding embryo grading

17:55 Can a poor-grade embryo become a baby?

20:04 Embryo freezing and survival rates

22:19 How ICSI works

25:46 Using AI to identify sperm

27:07 Sex selection and designer babies

28:39 Automation in IVF laboratories

31:33 Understanding IVF success rates 33:25 Why a good-looking embryo may not implant


About Knocked Up

Knocked Up is hosted by CREI fertility specialist Dr Raelia Lew and features honest, evidence-based conversations about fertility, IVF, reproductive health and pregnancy.


This episode is sponsored by Women’s Health Melbourne, providing expert fertility assessment, IVF, egg freezing, endometriosis management and personalised preconception care.


Learn more or book an appointment at womenshealthmelbourne.com.au.


This podcast provides general information and does not replace personalised medical advice. Please speak with a qualified healthcare professional about your circumstances.


Resources and support

Learn more about fertility treatment, IVF and egg freezing through:

This episode of Knocked Up is brought to you by Women’s Health Melbourne. To book an appointment visit www.womenshealthmelbourne.com.au 


The information shared in this podcast is general in nature and should not replace personalised medical advice.

Subscribe to Knocked Up and leave a review to help more people access informed, compassionate conversations about fertility and women’s health.






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Ever found yourself with a question about your body or your journey to parenthood that felt too awkward or complex to ask? That’s exactly the space where Knocked Up: The Podcast About Fertility and Women's Health lives. Hosted by Dr Raelia Lew, a specialist from Women's Health Melbourne, alongside Jordi Morrison, this series digs into the realities of fertility, pregnancy, and overall health without the jargon or judgement. Each episode feels like a candid chat with knowledgeable friends who aren’t afraid to tackle the tough topics, translating complicated medical concepts into conversations you can actually follow and use. It’s more than just a fertility podcast; it’s a resource for anyone curious about how their body works, from preconception through to postpartum and general wellbeing. The tone is straightforward, empathetic, and grounded in real experience, making often overwhelming subjects feel manageable. You’ll come away with clearer insights, practical knowledge, and perhaps a bit of reassurance for your own path. For regular updates, the team can be found on social media, but the heart of it all is in these frank and essential discussions. Tune in for a genuinely accessible take on women’s health, where no question is off the table.
Author: Language: English Episodes: 50

Knocked Up: All About Fertility and Women's Health
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