Ovarian response

Measures of how ovaries responded to stimulation. Useful after a cycle for understanding what happened and what might change.

Example answer83 %In the 70–85% rangeHow many of my eggs were mature?You need: Mature eggs, Total eggs retrievedOpen calculator →
Example answer64 %In the 60%+ rangeDid my follicles respond well?You need: Pre-ovulatory follicles, Antral follicle countOpen calculator →
Example answer79 %In the 70–85% rangeDid I get the expected number of eggs?You need: Eggs retrieved, Follicles aspiratedOpen calculator →
Example answer79 %In the 50–100% rangeHow many follicles gave an egg?You need: Eggs retrieved, Antral follicle countOpen calculator →
Example answer4.89 per 1000 IUIn the 1.7–5 rangeHow well did I respond to the medicine?You need: Eggs retrieved, Total gonadotropin doseOpen calculator →
Example answerGroup 2 of 4Age 36, adequate follicle countWhich POSEIDON group am I in?You need: Your age, Antral follicle count, Eggs retrieved previouslyOpen calculator →

Reading a stimulation cycle after the fact

These indices exist because "it did not work" is not a diagnosis. A cycle can go wrong at recruitment, at response, at retrieval, or at maturity — and each points somewhere different. FORT says whether available follicles responded; maturity rate points at trigger timing; OSI relates output to the dose used.

This matters because some findings are adjustable and others are not. A poor FORT is a protocol question. A low antral count is a reserve question. Knowing which you have is what makes the next cycle different from the last.