Home / Calculators / Ovarian response / Oocyte maturity rate
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These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Proportion of retrieved eggs mature enough to fertilise — often a trigger-timing question.
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.
Source — Typical reported maturity rates cluster around 75–85%, with meaningful variation between units and protocols.
Suitable for fertilisation
All eggs collected
That falls in the 70–85% band.
Your result of 83 % sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Within the usual range. Most units report somewhere around 75 to 85 percent.
Typical reported maturity rates cluster around 75–85%, with meaningful variation between units and protocols.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
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.
Usually. Some laboratories attempt in-vitro maturation, though outcomes are generally poorer than for naturally mature eggs. Ask your unit whether they do.
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.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Maturity is assessed at the point of stripping for ICSI; units using conventional IVF may not report it separately. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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