What Is an IUD and How Does It Work?
An IUD, medically known as an intrauterine device, is a small birth control device placed inside the uterus to prevent pregnancy. IUDs are usually T- or Y-shaped; in recent years, I-shaped or bead-based designs (such as the Ballerina IUD) have also been developed. They are primarily made of plastic and most commonly wrapped with copper coils. In addition to copper IUDs, there are also silver-containing and progesterone hormone–releasing IUDs. An IUD prevents pregnancy by stopping sperm from reaching the uterus or by making it difficult for a fertilized egg to implant in the uterine lining.
Types of IUDs and Their Mechanism of Action
IUDs are classified into two main categories: copper-containing IUDs and hormone-releasing IUDs. Copper IUDs work by creating an environment that is toxic to sperm and unfavorable for fertilization. Hormonal IUDs thin the uterine lining and thicken cervical mucus, making it difficult for sperm to enter the uterus. In both methods, fertilization of the egg is effectively prevented.
When Is an IUD Not Suitable?
Although IUDs are safe and effective for many women, they are not recommended in certain situations:
Active Pelvic Infection: An IUD may facilitate the spread of infection to the uterus and fallopian tubes.
Uterine or Cervical Cancer: IUD use may not be safe in these conditions.
Abnormal Uterine Anatomy: An abnormally shaped or sized uterus may prevent proper placement of the IUD and reduce its effectiveness.
Copper Allergy: Copper IUDs are not recommended for women with copper sensitivity or allergy.
History of Pelvic Inflammatory Disease (PID): IUD use may increase the risk of PID recurrence.
Unexplained Vaginal Bleeding: IUD placement is not recommended until the cause of bleeding is diagnosed.
Suspected Pregnancy: IUD insertion should not be performed if pregnancy is suspected.
Effectiveness of the IUD Birth Control Method
When properly placed, IUDs provide very high contraceptive protection. Copper IUDs have an effectiveness rate of approximately 98% in the first year of use. Hormonal IUDs (such as Mirena, Kyleena, Liletta, and Skyla) are similarly effective, with about 99% protection. This means that only 1 out of 100 women may become pregnant within a year. However, effectiveness may decrease if the IUD shifts or is expelled.
Can You Get Pregnant While Using an IUD?
No birth control method is 100% effective. Although rare, pregnancy can occur while using an IUD, particularly if the device moves from its proper position. For this reason, a follow-up check is recommended within the first month after insertion to ensure correct placement.
When Should an IUD Be Inserted?
An IUD is usually inserted toward the end of the menstrual period, when the cervix is slightly more open. This timing makes the procedure easier and more comfortable, and it also helps rule out an existing pregnancy.
IUDs can be an effective option for women seeking reliable, long-term contraception. However, it is essential to consult a healthcare professional to determine the most suitable birth control method for you.
What Should Be Done If Pregnancy Occurs While Using an IUD?
Although pregnancy with an IUD is rare, certain important steps should be taken if it occurs:
1. Pregnancy Test and Confirmation:
If you notice pregnancy symptoms while using an IUD, take a pregnancy test to confirm. If positive, consult a doctor immediately.
2. Medical Evaluation:
Your doctor may request an ultrasound to determine the location of the IUD and whether the pregnancy is intrauterine or ectopic. The risk of ectopic pregnancy is slightly higher with an IUD, making this evaluation critical.
3. Removal of the IUD:
If the pregnancy is intrauterine, your doctor may recommend removing the IUD. Leaving it in place increases the risk of bleeding, miscarriage, infection, and preterm birth. Removal should be done carefully, especially in early pregnancy, to reduce risks.
4. Pregnancy Monitoring:
After IUD removal, the pregnancy may continue normally. If the IUD cannot be removed, close monitoring throughout pregnancy is required to detect and manage complications early.
5. In Case of Ectopic Pregnancy:
If the pregnancy is ectopic (outside the uterus, such as in the fallopian tube), urgent medical treatment is necessary.
6. Psychological Support:
Becoming pregnant while using an IUD can be unexpected and stressful. Psychological support may help manage emotional challenges during this process.
Management of pregnancy with an IUD depends on a detailed medical evaluation and shared decision-making with your doctor. Professional medical guidance is essential in all cases.
When Should an IUD Be Removed?
An IUD is designed for long-term contraception, and its duration of use depends on the type. Removal timing may vary based on personal preference, health status, and other factors.
1. When Its Effective Duration Ends:
Copper IUDs: Effective for up to 10 years. After this period, removal and replacement are recommended.
Hormonal IUDs: Devices such as Mirena, Kyleena, and Liletta are typically effective for 3–5 years and should be replaced afterward.
2. Desire for Pregnancy:
If you plan to become pregnant, the IUD should be removed. Fertility usually returns quickly after removal.
3. Side Effects or Complications:
If significant side effects such as pain, irregular bleeding, or infection occur, your doctor may recommend removal. Serious conditions like PID may require urgent removal.
4. After Menopause:
After menopause, contraception is no longer needed, and the IUD can be removed. While leaving it in place is not usually harmful, removal is generally recommended.
5. Displacement or Expulsion:
If the IUD shifts or is expelled, effectiveness decreases and removal may be necessary. A new IUD can be inserted if desired.
6. Switching to Another Birth Control Method:
If you decide to use a different contraceptive method, the IUD can be removed when the new method is initiated.
7. Suspected Pregnancy:
If pregnancy is confirmed while using an IUD, removal is usually recommended to reduce the risk of complications.
8. Routine Replacement:
Regular follow-ups are important. Your doctor will advise when the IUD should be replaced or removed during routine check-ups.
IUD removal is generally quick and simple but should always be performed by a healthcare professional. Discussing the timing and process with your doctor is the best approach.