Traditionally, IVF stimulation started on cycle day 2–3. Now, random-start ovarian stimulation allows starting on any day of the cycle.
Conventional Protocol
- Start medication cycle day 2–3
- Follicular phase stimulation
- 10–12 days duration
- One cycle per menstrual cycle
Random-start Protocol
- Start any day — early follicular, late follicular, or luteal phase
- Enables DuoStim (2 rounds in 1 cycle)
- Ideal for: fertility preservation before chemo, poor responders, tight schedules
Comparative Outcomes
Meta-analyses show no significant difference in egg yield, blastocyst formation, or pregnancy rates between the two protocols.
Who Benefits from Random-start
- Cancer patients needing egg freezing before chemotherapy
- Poor responders considering DuoStim
- Patients with tight schedules or travel constraints
- Very irregular cycles
