300- 400 picogram/ ml (1000 - 1300 pmol/ l) for hver follikel med en diameter større end 18 mm), induceres den sidste fase af follikelmodningen ved indgivelse af hCG.
When ultrasonographic evaluation indicates the presence of at least three follicles of 16- 20 mm, and there is evidence of a good oestradiol response (plasma levels of about 300-400 picograms/ ml (1000-1300 pmol/ l) for each follicle with a diameter greater than 18 mm), the final phase of maturation of the follicles is induced by administration of hCG.