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POSEIDON group calculator

Which POSEIDON group am I in?

Which low-prognosis group a cycle falls into. A classification for planning, not a prediction of outcome.

Your age

years

Antral follicle count

At baseline

Eggs retrieved previously

0 if this is your first cycle

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

Example answer

2group

Group 2

35 or over with adequate reserve but an unexpected poor response. Protocol adjustment is still the main lever, with age as an additional factor.

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.

Age: 36 (35 or over)
AFC: 6 (adequate)
Previous retrieval: 5 eggs

What each result means

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

Your resultGroup 1

Under 35 with adequate ovarian reserve but an unexpected poor or suboptimal response. This is the group where protocol change is most likely to help, because reserve is not the limiting factor.

Your resultGroup 2

35 or over with adequate reserve but an unexpected poor response. Protocol adjustment is still the main lever, with age as an additional factor.

Your resultGroup 3

Under 35 with low reserve markers. An expected poor response — planning usually focuses on maximising oocyte yield across cycles rather than on any single attempt.

Your resultGroup 4

35 or over with low reserve markers. The most challenging group, where cumulative strategies and an early conversation about all options including donor eggs are usual.

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.

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Your embryos

This calculator: Which POSEIDON group am I in?

Calculators for what comes next

How this is worked out

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.

About this calculator

?What it tells you

For people with a low response. Which low-prognosis group a cycle falls into. A classification for planning, not a prediction of outcome.

✓When to use it

After a poor response, to understand which conversation to have

iWhat you need

Your age (years)
Antral follicle count
Eggs retrieved previously

!What it cannot tell you

POSEIDON is a planning framework applied by a clinician alongside your full history.

Common questions

What is POSEIDON for?

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.

Does my group predict success?

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.

Does my group ever change?

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.

Sources

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.

POSEIDON criteria for low prognosis patients

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.