Intrauterine devices (IUDs)

Definition

Intrauterine devices (IUDs) are small, T-shaped devices inserted into the uterus for long-term birth control. IUDs can be hormonal or non-hormonal and work primarily by preventing fertilization.

5 Must Know Facts For Your Next Test

1. Hormonal IUDs release progestin to thicken cervical mucus and thin the uterine lining.
2. Non-hormonal IUDs, like those made of copper, create an inhospitable environment for sperm.
3. IUDs are over 99% effective in preventing pregnancy.
4. They can remain effective for 3 to 10 years depending on the type.
5. Insertion procedures should be done by a healthcare provider and may cause temporary discomfort.

Review Questions

• What are the two main types of intrauterine devices?
• How do hormonal IUDs prevent pregnancy?
• For how many years can a non-hormonal copper IUD remain effective?

Related terms

Progestin: A synthetic form of progesterone used in hormonal contraceptives.

Cervical Mucus: A fluid produced by the cervix that changes consistency during the menstrual cycle.

Endometrium: The inner lining of the uterus that thickens during the menstrual cycle in preparation for possible implantation of an embryo.