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Fertility Glossary

Follicle

A fluid-filled sac in the ovary containing an egg.

Follicles grow during the menstrual cycle in response to FSH. Their number and size are tracked by ultrasound during IVF stimulation.

Related terms

FSH

Follicle-stimulating hormone.

Ultrasound monitoring

Serial scans during an IVF or IUI cycle.

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