In vitro fertilization basics part 3

Having ‘spare embryos’ for a further chance of pregnancy is a bonus but not the aim of in vitro fertilization treatment-about 30% of couples have ‘spare’ embryos frozen.

Ovarian stimulation is monitored by blood tests and ultrasound scans. Once the follicles have grown to the right size, a trigger injection of the hormone hCG causes the follicles and their  eggs to undergo the final step in maturation. Egg collection is scheduled 36 hours after the trigger injection, just before ovulation would otherwise occur.

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