Low AMH: more collections, not just higher doses.

Dual stimulation means one ovarian stimulation from the start of the menstrual cycle, then a second stimulation a few days after the first egg collection, in the same cycle.

Each stimulation ends in its own egg collection. The ovary often has a second wave of follicles after the first collection, and the second stimulation uses it instead of waiting for the next period. Eggs or embryos from both are frozen and used together. There is no fresh transfer in a dual stimulation cycle.

With low reserve, a higher dose does not reliably make more eggs, because the ovary has fewer follicles to respond.

Medication can only grow follicles that are already there. Past a point, more of it adds cost and side effects, not eggs. International guidance advises against very high doses in women expected to respond poorly. Collecting across more than one stimulation, and freezing what is collected, is often the more productive route.

Because at every step from egg to embryo some are lost, so the number at the start decides how many reach the end.

Not every egg collected is mature. Not every mature egg fertilises. Not every fertilised egg grows into a blastocyst (a day 5 or 6 embryo). And not every blastocyst has the right number of chromosomes, which becomes more common with age. Sperm quality and lab conditions matter at each step too. That is why one collection with two or three eggs can end with nothing to transfer.

The second stimulation usually starts a few days after the first egg collection, in the same cycle, without waiting for a period. [CONFIRM: usually about 5 days]

It runs for a similar length to the first, with scans to track the follicles, and ends with a trigger injection and a second collection. The lining is not used for a transfer that month, so all embryos are frozen. A frozen transfer follows in a calmer later cycle, which is how more than 90% of our transfers are done anyway.

Dual stimulation suits women with low ovarian reserve (low AMH or few follicles on scan), especially when age makes time short, and some women freezing eggs before cancer treatment.

It is not for everyone with a low AMH. Younger women may need fewer eggs for a reasonable chance, and one well-planned stimulation can be enough. Women with PCOS or a high reserve don't need it. Dr Vani decides from your age, AMH, follicle count and how you responded before.

Dual stimulation collects more of your eggs in less time; it does not make each egg healthier, and it cannot create eggs the ovary no longer has.

ESHRE recognises it as a way to accumulate eggs or embryos when no fresh transfer is planned; it has not been shown to raise the chance per egg. If collections repeatedly bring very few eggs, poor-quality eggs or embryos that stop growing, we will say so plainly. Over 40 with extremely low reserve, that conversation includes donor eggs, and the choice is always yours.