3 doctors weighed in:

At what follicle size should an hCG trigger shot be administered in a medicated cycle?

3 doctors weighed in
Dr. Neeoo Chin
Fertility Medicine
2 doctors agree

In brief: Depends

Usually ultra sound is by the vaginal route these days.
If abdominal ultrasound is performed then the follicles are usually approximately 2 mm smaller. On Clomid (clomiphene) or Femara i usually trigger ovulation with HCG approximately 18 to 20 mm. With gonadotropins i normally trigger ovulation around 20 -21mm. Patients with pcos or polycystic ovarian syndrome triggering ovulation needs to be somewhat later at approximately 21 to 22 mm.

In brief: Depends

Usually ultra sound is by the vaginal route these days.
If abdominal ultrasound is performed then the follicles are usually approximately 2 mm smaller. On Clomid (clomiphene) or Femara i usually trigger ovulation with HCG approximately 18 to 20 mm. With gonadotropins i normally trigger ovulation around 20 -21mm. Patients with pcos or polycystic ovarian syndrome triggering ovulation needs to be somewhat later at approximately 21 to 22 mm.
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