IUI Pregnancy Rates & Sperm Count: ASRM 2015 Study Insights

A 2015 Shady Grove Fertility study of 47,500 IUI cycles reveals that post-wash total motile sperm count directly impacts pregnancy success. At 9 million motile sperm, clinical pregnancy rates plateau at 16.9%, while counts below 1 million yield less than 5% success.

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Key Takeaways

How Sperm Count Predicts IUI Success Rates

The study found a clear correlation between post-wash total motile sperm count and IUI outcomes. For counts above 9 million, success rates remain stable at ~16.9%, but drop significantly below this threshold.

9 Million Sperm Threshold for Optimal IUI Results

Couples with ≥9 million moving sperm post-wash achieved the highest 16.9% pregnancy rate per cycle. Increasing sperm counts beyond this threshold did not improve success rates.

Low Sperm Counts Dramatically Reduce IUI Chances

The study showed counts below 1 million produced <5% success rates. For example, 0.25-0.49 million sperm resulted in only 2.8% pregnancy rates per cycle.

Sperm Morphology Predicts Post-Wash Sperm Quality

Baseline sperm morphology (shape) was identified as the strongest predictor of post-wash sperm counts. Poor morphology correlates with lower usable sperm after IUI preparation.

Diagnostic Sperm Wash for Accurate IUI Counseling

Patients with borderline sperm counts should request a diagnostic semen wash to determine actual post-wash motile sperm counts, enabling more precise IUI success rate predictions.

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