What do systematic reviews say?

GnRH agonists vs HCG

GnRH agonist probably leads to lower live birth compared with HCG (moderate certainty).

• Gonadotropin‐releasing hormone agonist versus HCG for oocyte triggering in antagonist‐assisted reproductive technology 2014 · Cochrane Headline outcomes only
  OR 0.47 [0.31, 0.7]
  5 studies · 532 participants
  Moderate