In a woman with uterine fibroids, is a levonorgestrel‑releasing intrauterine device (LNG‑IUD) appropriate for contraception, and what are the contraindications and alternative options?

LNG-IUD Use in Women with Uterine Fibroids

A levonorgestrel-releasing intrauterine device (LNG-IUD) is generally appropriate for contraception in women with uterine fibroids and carries a Category 2 classification (benefits generally outweigh risks), though expulsion rates may be higher than in women without fibroids.

Key Recommendation

The U.S. Medical Eligibility Criteria classifies uterine fibroids as Category 2 for LNG-IUD use, meaning the advantages of using the method generally outweigh the theoretical or proven risks 1. This classification applies to both initiation and continuation of the LNG-IUD. Importantly, fibroids are not a contraindication to LNG-IUD placement unless they distort the uterine cavity in a manner incompatible with insertion (Category 4) 1.

Clinical Benefits in Women with Fibroids

Evidence demonstrates that LNG-IUD use in women with fibroids provides substantial therapeutic benefits beyond contraception:

• Reduced menstrual blood loss: Studies show significant reductions in bleeding, with median PBAC scores decreasing from 145.0 pre-insertion to 36.0 after 12 months 2
• Improved anemia: Hemoglobin concentrations increased significantly from median 100.0 g/L to 119.5 g/L after 12 months in anemic patients 2
• Symptom control: The LNG-IUS effectively manages heavy menstrual bleeding associated with fibroids, improving quality of life 3, 4, 5

The 2024 ACR guidelines specifically list progestin-containing IUDs as first-line medical management for reducing bleeding symptoms in women with fibroids 3.

Important Caveats and Risk Considerations

Higher Expulsion Risk

The primary concern with LNG-IUD use in fibroid patients is increased expulsion rates. Evidence shows expulsion rates of 11% in women with fibroids compared to 0-3% in women without fibroids, though statistical significance varied across studies 1. Non-comparative studies reported expulsion rates ranging from 0-20% 1.

Contraindications to Consider

The LNG-IUD should NOT be used if:

• Anatomical distortion: Any uterine abnormality (congenital or acquired, including fibroids) that distorts the cavity in a manner incompatible with IUD insertion is Category 4 1
• Heavy or prolonged bleeding: Women with these symptoms should be assigned the category for that specific condition rather than fibroids alone 1
• Undiagnosed abnormal uterine bleeding: This is an absolute contraindication until evaluation is complete 6

Clinical Algorithm for Decision-Making

Step 1: Assess uterine cavity

• Perform transvaginal and transabdominal ultrasonography to evaluate fibroid size, number, and location 5
• If cavity distortion is present that would prevent proper placement → Do not insert LNG-IUD (Category 4)
• If cavity is not significantly distorted → Proceed to Step 2

Step 2: Evaluate bleeding pattern

• If patient has heavy or prolonged bleeding → Counsel that LNG-IUD may improve symptoms but expulsion risk is higher
• If bleeding is normal → Standard Category 2 applies

Step 3: Counseling and monitoring

• Before insertion, counsel specifically about:
  • Expected bleeding changes (spotting/light bleeding first 3-6 months, then reduction) 7
  • Higher expulsion risk (up to 11%) 1
  • Need to monitor for displacement
• After insertion, if irregular bleeding occurs:
  • Rule out LNG-IUD displacement, STD, pregnancy, or new pathologic conditions 7
  • Reassure that bleeding irregularities are generally not harmful
  • Consider alternative methods if bleeding persists and is unacceptable to patient

Alternative Contraceptive Options

If LNG-IUD is not appropriate or fails, alternatives include:

Hormonal options:

• Combined oral contraceptives (reduce bleeding symptoms) 3, 4, 5
• Progestin-only pills 4, 5
• Copper IUD (though may worsen bleeding) 1
• Injectable DMPA
• Contraceptive implant

Non-contraceptive medical management (if contraception not primary goal):

• GnRH antagonists (relugolix combination therapy) for symptom control 3, 4, 8
• Tranexamic acid for bleeding control 3, 4, 5

Common Pitfalls to Avoid

1. Don't assume all fibroids preclude LNG-IUD use - Only cavity-distorting fibroids are absolute contraindications
2. Don't fail to counsel about expulsion risk - This is the most significant concern and patients need informed consent
3. Don't ignore new-onset bleeding - Always evaluate for displacement, especially in fibroid patients 7
4. Don't overlook therapeutic benefits - The LNG-IUD can actually improve fibroid-related symptoms, making it both contraceptive and therapeutic 2, 4