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IVF success rates are typically reported as the percentage of embryo transfers that result in a live birth. The most authoritative source in the United States is the CDC's annual Assisted Reproductive Technology (ART) report, compiled in partnership with the Society for Assisted Reproductive Technology (SART). These reports track outcomes from nearly all IVF cycles performed at U.S. fertility clinics.
The live birth rate per cycle is calculated as: Number of live births Γ· Number of embryo transfer cycles Γ 100. Cumulative rates consider multiple cycles from the same egg retrieval or across consecutive treatment cycles.
Multiple factors influence IVF outcomes. Here are the most significant, ranked by impact:
1. Age (most important): Egg quantity and quality decline with age, especially after 35. This is the single strongest predictor of IVF success.
2. Ovarian Reserve (AMH): Anti-MΓΌllerian hormone levels indicate how many eggs remain in the ovaries. Lower AMH often means fewer eggs retrieved per cycle, though it does not directly predict egg quality.
3. BMI: Both underweight and obesity can affect hormone balance, egg quality, and implantation. Studies show optimal outcomes in the normal BMI range (18.5β24.9).
4. Diagnosis: The underlying cause of infertility matters. For example, PCOS patients often produce many eggs but may face implantation challenges, while DOR patients produce fewer eggs.
5. Previous Cycles: Patients with prior failed cycles may have lower subsequent success rates, but this varies by cause and treatment adjustments.
6. Fresh vs. Frozen Transfer: Frozen embryo transfers (FET) now show comparable or slightly higher success rates than fresh transfers in many age groups, partly due to better endometrial preparation.
The table below shows national average live birth rates per embryo transfer, based on the most recent CDC ART report. These are the baseline rates used in our calculator.
| Age Group | Fresh Transfer LBR | Frozen Transfer LBR | Avg. Eggs Retrieved | Avg. Embryos Transferred |
|---|---|---|---|---|
| <35 | 46.2% | 52.1% | 14.8 | 1.2 |
| 35β37 | 37.8% | 44.3% | 12.1 | 1.3 |
| 38β40 | 26.5% | 33.7% | 9.4 | 1.5 |
| 41β42 | 13.2% | 20.9% | 6.2 | 1.8 |
| >42 | 4.3% | 9.1% | 3.5 | 2.1 |
Source: CDC 2023 Assisted Reproductive Technology Fertility Clinic and National Summary Report. LBR = Live Birth Rate per embryo transfer.
Luohu Hospital's Reproductive Medicine Center consistently achieves success rates that exceed national averages. Key differentiators include:
Advanced Laboratory Technology: Luohu Hospital uses time-lapse embryo monitoring, preimplantation genetic testing (PGT-A), and advanced vitrification techniques that improve embryo selection and survival rates.
Personalized Protocols: Unlike the one-size-fits-all approach common at high-volume clinics, Luohu's specialists tailor stimulation protocols to each patient's ovarian reserve, age, and prior response β optimizing egg quality and quantity.
Experienced Team: Luohu's embryologists and reproductive endocrinologists bring decades of combined experience with complex cases, including patients who have failed multiple cycles elsewhere.
Integrated Care: Patients benefit from integrated support including acupuncture, nutritional counseling, and psychological support β factors shown to improve IVF outcomes in clinical studies.
Through FertiJourney, international patients can access Luohu Hospital's world-class care with full language support, travel coordination, and transparent pricing.