Fertility Glossary

Gestational sac

The fluid-filled structure seen on early ultrasound around a developing pregnancy.

A gestational sac is usually visible from about five weeks on transvaginal ultrasound. Seeing it inside the uterus helps exclude an ectopic pregnancy.

Related terms

Transvaginal ultrasound

An internal scan using a slim probe placed in the vagina.

Ectopic pregnancy

A pregnancy that implants outside the uterus, usually in a fallopian tube.

Clinical pregnancy

A pregnancy confirmed on ultrasound.

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