Higher birth rate after recombinant hCG triggering compared with urinary-derived hCG in single-blastocyst IVF antagonist cycles: a randomized controlled trial.

In a prospective randomized controlled trial, 119 patients were randomized to receive either recombinant hCG (250 μg) or urinary-derived hCG (10,000 IU) for final oocyte maturation in an antagonist protocol with a fixed dose of recombinant FSH (187.5 IU) and predefined single blastocyst transfer. The delivery rate was improved in the recombinant hCG group compared with the urinary-derived hCG group (44.1 vs. 25.7, respectively); however, adequately powered randomized controlled trials are justified to ascertain whether this difference is true.