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Embryo grading explained calculator

What does my embryo grade mean?

What a Gardner grade like 4AA actually describes — expansion, inner cell mass, and trophectoderm.

Expansion grade

1–6

The number in 4AA

Inner cell mass

1=A 2=B 3=C

First letter

Trophectoderm

1=A 2=B 3=C

Second letter

These are example numbers. Replace them with yours, then press Calculate.

Example answer

100/ 100

Higher

A well-graded blastocyst. Grading is a visual assessment though, and a good grade does not confirm the embryo is chromosomally normal.

This is a guide, not a diagnosis. Share the result with your doctor.

Your result on the scale

The ranges this calculator uses. Yours is highlighted.

Your numbers

Everything worked out from what you entered.

Your grade: 4AA
Expansion: 4 — expanded
Inner cell mass: A — becomes the baby
Trophectoderm: A — becomes the placenta

What each result means

Your result is highlighted. Your own clinic's advice always comes first.

Your resultLower

A lower-graded blastocyst. Grading correlates with implantation but predicts it imperfectly — lower-graded embryos produce healthy babies regularly, and grade says nothing about chromosomal status.

Your resultMiddle

A reasonable grade. Most transferred embryos sit in this range.

Your resultHigher

A well-graded blastocyst. Grading is a visual assessment though, and a good grade does not confirm the embryo is chromosomally normal.

Where this fits in your journey

The usual order, from trying to conceive to pregnancy. Not everyone needs every stage. This calculator belongs to stage 4.

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Your embryos

This calculator: What does my embryo grade mean?

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How this is worked out

Population estimateAn average for people with your inputs, not a prediction for you. Individual outcomes vary widely around it.

Gardner grading gives a blastocyst a number for expansion and two letters for inner cell mass and trophectoderm quality, as in 4AA. Grade correlates with implantation but does not indicate whether an embryo is chromosomally normal.

About this calculator

?What it tells you

Grades like 4AA, in plain words. What a Gardner grade like 4AA actually describes — expansion, inner cell mass, and trophectoderm.

✓When to use it

When handed a grade like 4AA with no explanation

iWhat you need

Expansion grade (1–6)
Inner cell mass (1=A 2=B 3=C)
Trophectoderm (1=A 2=B 3=C)

!What it cannot tell you

Grading is subjective and varies between embryologists and laboratories.

Common questions

Does a lower grade mean it will not work?

No. Grading correlates with implantation but predicts it imperfectly. Lower-graded embryos produce healthy babies routinely, and units transfer them all the time.

Does grade tell me if it is chromosomally normal?

No. Grading is a visual assessment of appearance. Euploid embryos can look poor and aneuploid embryos can look excellent — only genetic testing answers that question.

Which letter matters more?

Inner cell mass is generally weighted more heavily, since it becomes the fetus. Trophectoderm grade has also been associated with implantation, and units differ in how they weigh them.

Sources

Gardner grading: a number for expansion (1–6) then two letters for inner cell mass and trophectoderm quality (A best, C poorest). Grading is subjective and varies between embryologists.

Gardner blastocyst grading system

In an emergency

If you have any of the warning signs listed here, don't wait for a test result or a calculator. Get help now.

112All emergencies, anywhere in India 108Ambulance

Also call your IVF clinic. Most clinics give an emergency number on your treatment or discharge sheet. Save it in your phone now, before you need it.