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Module 23

Reading your embryo results

Learn to read your lab report like an embryologist: what each word means, why numbers fall at every step, what embryo grades say about your chances, and what to ask.

  • 5lessons
  • 20 minreading
  • 6quiz questions
Start the module Take the quiz

The lessons and the quiz in this module are part of the Fertility with Kara Package. Module 1 is free to read.

Your way through Module 23

  1. Lesson 23.1 · 4 min The words on your lab report A plain-language guide to the terms embryologists use on reports and in those daily phone calls, from "MII" to "expanded blastocyst".
  2. Lesson 23.2 · 4 min Why the numbers fall at each step Why the numbers drop at every stage of IVF, from eggs collected to blastocysts, and what ranges labs expect.
  3. Lesson 23.3 · 4 min Day 3 grades decoded What embryologists look at on day 2 and day 3, how the features rank an embryo, and why a lower rank is not a verdict.
  4. Lesson 23.4 · 4 min Blastocyst grades decoded What a code such as 4AA or 3BB means, letter by letter, and why a grade describes chances rather than deciding them.
  5. Lesson 23.5 · 4 min Good questions, and when a cycle does not work The questions worth asking your clinic about your results, and what you can learn from a cycle that does not work.
  6. Quiz6 questions · 5 to passNot taken BadgeModule 23Earned with the quiz

Learning aims

By the end of this module you will be able to:

  • Recognise the common words on an IVF lab report, from MII and 2PN to morula and blastocyst.
  • Explain why numbers fall from eggs collected to mature eggs, fertilised eggs and blastocysts, and what ranges labs expect.
  • Describe how day 3 embryos are ranked by cell number, evenness, fragmentation and nuclei.
  • Decode a blastocyst grade such as 4AA or 3BB, part by part.
  • Explain why embryo grades describe chances rather than deciding outcomes.
  • Ask your clinic clear questions about your results, including after a cycle that does not work.

The module in brief

The module in brief
  • Lab days are counted from egg collection (day 0); fertilisation is checked on day 1, and blastocysts form on day 5 or 6.
  • Numbers fall at every step: labs expect about 75 to 90% of eggs to be mature, at least 65% of injected mature eggs to fertilise, and 40 to 60% of fertilised eggs to become blastocysts.
  • Embryos often stop growing because of problems within the embryo, such as chromosome errors, which become more common as women get older.
  • Day 3 embryos are ranked by cell number, evenness, fragmentation and nuclei: top, intermediate or low.
  • In a blastocyst grade such as 4AA, the number is expansion, the first letter the inner cell mass and the second letter the trophectoderm.
  • Grades rank embryos by appearance and estimate chances; lower-grade blastocysts can still become babies.
  • Your chance over a complete cycle, every transfer from one egg collection, gives a truer picture than one transfer.
  • A cycle that does not work is not anyone's fault, and a review of your lab report helps plan what comes next.
A note from Kara

Thank you for choosing to learn with me

I know you had many places to look for answers, and you chose this course. Thank you. It means a lot to me that you trust me with something this close to your heart.

Every lesson here is something I wish every couple could hear before they sit down with their clinic: how a life begins, what happens in the lab, and what the words on your report mean. Take it slowly. Short lessons, one at a time, are the way the science sinks in.

If a lesson raises a question about your own body or your own embryos, write it down and take it to your healthcare professional. That is exactly what this course is for.

Warmly, Kara

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