Does Mirena Interfere with IVF Controlled Ovarian Stimulation?
The levonorgestrel intrauterine device (Mirena) does not interfere with controlled ovarian stimulation for IVF and does not require removal prior to starting stimulation protocols. The device can remain in place during ovarian stimulation without compromising follicular development, oocyte quality, or cycle outcomes.
Evidence Supporting Continued Use
The most robust evidence comes from a 2018 retrospective cohort study that directly examined this question 1. When controlling for relevant variables (recent hormonal contraceptive use, antral follicle count, age, BMI, gonadotropin dose, and stimulation protocol), researchers found:
- No significant difference in total oocyte yield between women with and without LNG-IUDs
- No significant difference in mature oocyte yield
- No impact on clinical pregnancy rates in oocyte recipients
- No impact on live birth rates in oocyte recipients
Additional supporting evidence from case reports demonstrates successful IVF outcomes in egg donors using Mirena during treatment cycles, with satisfactory follicular development and oocyte quality 2.
Special Clinical Context: Endometrial Cancer
One specific scenario where Mirena is intentionally used during ovarian stimulation involves patients with early-stage endometrial cancer undergoing fertility preservation. A 2023 study showed that combining LNG-IUD treatment with segmented IVF (stimulation followed by frozen embryo transfer) achieved a 37.5% cumulative live birth rate in these patients 3. This demonstrates that not only does the device not interfere with stimulation, but it can provide therapeutic benefit in select populations.
Endometrial Considerations
While one 2024 study found that women with prior LNG-IUD use had slightly thinner endometrial stripes at embryo transfer compared to women with no contraceptive history (8.93 mm vs 10.32 mm), this did not translate to worse pregnancy outcomes 4. In fact, implantation rates were slightly higher in the LNG-IUD group (43.37% vs 24.17%).
Protocol Modifications
No modifications to standard controlled ovarian stimulation protocols are necessary when a Mirena is in place. You should proceed with:
- Standard gonadotropin dosing based on ovarian reserve markers (AMH, AFC) and patient characteristics
- Standard monitoring with transvaginal ultrasound and estradiol levels
- Standard trigger timing when appropriate follicular development is achieved
- Standard oocyte retrieval procedures
The choice between GnRH agonist and antagonist protocols should be based on the patient's ovarian response profile, not the presence of the IUD [@4,5,6@].
When to Consider Removal
The only scenario requiring Mirena removal before IVF would be if the patient has cavity distortion from other pathology (such as submucosal fibroids or polyps), which would independently affect implantation regardless of the IUD [@7,10@]. In such cases, address the underlying pathology rather than removing the IUD solely for stimulation purposes.
Practical Algorithm
- Assess ovarian reserve (AMH, AFC) - proceed with standard evaluation
- Evaluate uterine cavity - if normal, leave Mirena in place during stimulation
- Select stimulation protocol - based on ovarian response prediction, not IUD presence
- Remove Mirena before embryo transfer - timing can be coordinated with your freeze-all strategy
- Proceed with standard monitoring and retrieval
Important Caveat
If planning fresh embryo transfer (uncommon in current practice), the Mirena must be removed before transfer. However, most contemporary IVF cycles utilize a freeze-all strategy with subsequent frozen embryo transfer, allowing flexibility in timing IUD removal after oocyte retrieval [@4,5@].