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Oocyte maturity rate calculator

How many of my eggs were mature?

Q: What causes low maturity?

Most commonly trigger timing — given too early relative to follicle size. Trigger type and individual response also matter. It is one of the more modifiable findings between cycles.

Q: Do immature eggs get discarded?

Usually. Some laboratories attempt in-vitro maturation, though outcomes are generally poorer than for naturally mature eggs. Ask your unit whether they do.

Q: Can immature eggs be used at all?

Some laboratories attempt in-vitro maturation, though success rates are meaningfully lower than for naturally mature eggs and not every unit offers it. Ask whether yours does and what its own results look like before counting on it.

The proportion of retrieved eggs that were mature enough to fertilise. Says something about trigger timing and stimulation.

Mature eggs (MII)

Suitable for fertilisation

Total eggs retrieved

All eggs collected

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

Example answer

83%

70–85%

Within the usual range. Most units report somewhere around 75 to 85 percent.

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.

Mature (MII): 10
Total retrieved: 12
Immature or degenerate: 2

What each result means

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

Your result<50%

Low maturity. Trigger timing, trigger type, and the stimulation protocol are the usual things reviewed. This is one of the more adjustable findings in a cycle.

Your result50–70%

Below typical. Often prompts a look at when the trigger was given relative to follicle sizes.

Your result70–85%

Within the usual range. Most units report somewhere around 75 to 85 percent.

Your result85%+

A high maturity rate, suggesting trigger timing suited your follicle cohort well.

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.

Stage 4 · you are here

During an IVF cycle

Make sense of the numbers your clinic gives you.

Medicines
→
Egg collection
→
Your embryos

This calculator: How many of my eggs were mature?

Calculators for what comes next

How this is worked out

Exact calculationArithmetic on the numbers you enter. If your inputs are right, this figure is right.

Oocyte maturity rate is mature MII eggs divided by total eggs retrieved. Typical rates are 75 to 85%; a low rate most often reflects trigger timing relative to follicle size, which is one of the more adjustable findings between cycles.

About this calculator

?What it tells you

Mature eggs out of those collected. The proportion of retrieved eggs that were mature enough to fertilise. Says something about trigger timing and stimulation.

✓When to use it

When the mature count came in well below the total retrieved

iWhat you need

Mature eggs (MII)
Total eggs retrieved

!What it cannot tell you

Maturity is assessed at the point of stripping for ICSI; units using conventional IVF may not report it separately.

Common questions

What causes low maturity?

Most commonly trigger timing — given too early relative to follicle size. Trigger type and individual response also matter. It is one of the more modifiable findings between cycles.

Do immature eggs get discarded?

Usually. Some laboratories attempt in-vitro maturation, though outcomes are generally poorer than for naturally mature eggs. Ask your unit whether they do.

Can immature eggs be used at all?

Some laboratories attempt in-vitro maturation, though success rates are meaningfully lower than for naturally mature eggs and not every unit offers it. Ask whether yours does and what its own results look like before counting on it.

Sources

Typical reported maturity rates cluster around 75–85%, with meaningful variation between units and protocols.

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.