I went in for a scan today in anticipation of doing a modified natural cycle, it’s day 10 – LH levels are rising -I’ve not reached ovulation yet, LH normally surges on day 14 for me. The lining was trilaminar and 9.5mm in thickness and lead follicle was 23mm. The nurse said trigger tonight and come in next Monday for transfer. I asked whether there was any benefit in delaying trigger, letting my lining grow a bit more naturally before we trigger (historically it has grown a bit each day). She said she was happy to postpone the transfer date by a couple of days.. so that’s what we’re doing.. The plan is to trigger on day 12 (instead of day 10), assuming I’ve not got my surge before then, and start progesterone that day and transfer 7 days after trigger…Does that sound like a sensible plan to you – does it hurt to let the lining grow a bit thicker before we trigger? Many thanks for your help in advance! Best wishes, Cassidy.
Is there an optimal timing of the trigger/embryo transfer on a modified natural cycle
Cassidy O
August 14, 2023
Question
Answer
Candidly, I am not a fan of modified natural cycle FET’s. However, the time to trigger is just before the onset of the natural LH surge.; This is determined by the size (20+mm) of the dominaqnt follicle and bloopd E2. (150pg/ml+ or 300+ if there are >2 dominant folli9cles.
GS
Dr. Geoffrey Sher
August 15, 2023
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