Home / Calculators / Ovarian response / POSEIDON classification
Every calculator in one place, free and with no sign-up. Results show instantly — we don't hide them behind a form. Each one explains what the number means, where the reference ranges come from, and what it cannot tell you.
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.
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.
Which low-prognosis group a cycle falls into, and what it implies.
Compared to published rangesYour values checked against published reference limits. The source is named below; laboratory methods vary.
POSEIDON sorts low-prognosis patients into four groups using age and ovarian reserve markers. Groups 1 and 2 have adequate reserve with an unexpected poor response, where protocol change is most likely to help; groups 3 and 4 have low reserve markers.
Source — POSEIDON criteria (Patient-Oriented Strategies Encompassing IndividualizeD Oocyte Number). Groups 1 and 2 have adequate reserve markers with unexpected response; groups 3 and 4 have low markers.
The bands on this page are drawn from published sources but have not yet been reviewed by our medical team, and some vary by laboratory or assay. Check against the reference range printed on your own report.
At baseline
0 if this is your first cycle
That falls in the Group 2 band.
Your result of 2 group sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
35 or over with adequate reserve but an unexpected poor response. Protocol adjustment is still the main lever, with age as an additional factor.
POSEIDON criteria (Patient-Oriented Strategies Encompassing IndividualizeD Oocyte Number). Groups 1 and 2 have adequate reserve markers with unexpected response; groups 3 and 4 have low markers.
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.
It replaces the single label "poor responder" with four groups that imply different actions. Unexpected poor response with good reserve is a protocol problem; expected poor response with low reserve is a planning problem.
Not directly. It describes the challenge, not the outcome. Group 1 generally has the best prognosis of the four because reserve is not the limiting factor.
Yes. Groups 1 and 2 are defined by an unexpected response, so a cycle with a different protocol can move you out of them. Groups 3 and 4 are defined by reserve markers, which do not improve — though how those follicles respond still can.
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.
POSEIDON is a planning framework applied by a clinician alongside your full history. 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.
Comparing centres? See every ART-registered fertility clinic in Bangalore, scored on the same five signals.
