Home / Calculators / Ovarian response / Oocyte retrieval 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.
Eggs collected relative to follicles aspirated.
Exact calculationArithmetic on the numbers you enter. If your inputs are right, this figure is right.
Oocyte retrieval rate is eggs collected divided by follicles aspirated. Most units see 70 to 85%, because smaller follicles frequently contain no retrievable egg — a modest shortfall is expected rather than a problem.
Source — Retrieval rates vary with follicle size distribution and technique. Not all follicles are expected to yield an egg.
Total collected
Punctured at retrieval
That falls in the 70–85% band.
Your result of 79 % sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Within the usual range. Some follicles never contain a retrievable egg.
Retrieval rates vary with follicle size distribution and technique. Not all follicles are expected to yield an egg.
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.
Smaller follicles frequently contain no retrievable egg, and the cohort is never uniform in size. A modest shortfall is expected rather than a problem.
Rare, and usually caused by a problem with trigger administration or absorption rather than by the ovaries. It is worth confirming the trigger was given correctly and at the right time.
Rarely. Follicle size distribution is the main driver — smaller follicles frequently contain no retrievable egg. Persistent very low rates across cycles are worth raising, but a single modest result usually reflects the cohort rather than technique.
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.
Retrieval rate reflects follicle size distribution and technique as much as ovarian function. 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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