As a classicgold standardprotocol,stable pregnancy outcome can be obtained by using the GnRH agonist long protocol.The timing of HCG in GnRH agonist cycles is usually on the day when one or more 17-22 mm follicles are present.As a newly emerging protocol,GnRH antagonist protocol is generally used in clinic.There is a big difference in the mechanism and medications between the GnRH agonist and antagonist protocol,so proper selection of trigger timing is very important.Existing data showed the trigger timing ...
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