A follicle is a fluid-filled sac in the ovary that contains an egg ready to mature and be released.
Throughout the cycle, follicles grow under hormone signals until one reaches the size for ovulation.
Doctors usually look for a follicle around 18 mm to 22 mm before ovulation or fertility procedure.
A mature follicle increases the chances that the released egg will be healthy and capable of fertilisation.
Ultrasound scans track follicle growth to decide the right time for intercourse, IUI or egg retrieval.
Once the follicle reaches the target size, ovulation is triggered naturally or with an injection.
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