| Not Yet Recruiting | Royal Jelly Supplementation in Unexplained Male Infertility NCT07337265 | Medipol University | N/A |
| Not Yet Recruiting | ICSI Versus Conventional IVF in Couples With Unexplained Infertility NCT07294027 | Second Affiliated Hospital, School of Medicine, Zhejiang University | N/A |
| Recruiting | Possible Action of Resveratrol in Improving the Outcomes of IVF/ICSI in Couples With Unexplained Infertility NCT06481696 | Andros Day Surgery Clinic | N/A |
| Completed | Cost-effective Treatment of Unexplained Infertility NCT06178523 | Batterjee Medical College | Phase 4 |
| Recruiting | Varicocelectomy in Patients With Clinical Varicocele and Unexplained Infertility NCT06491251 | Kafrelsheikh University | N/A |
| Withdrawn | Probiotic and Antibiotic Therapies in Women With Unexplained Infertility NCT04955574 | McMaster University | Phase 2 |
| Recruiting | IUI With Letrozole Versus in Natural Cycle NCT04169451 | Peking University Third Hospital | N/A |
| Completed | Elagolix for Fertility Enhancement Clinical Trial NCT04039204 | Wake Forest University Health Sciences | Phase 2 |
| Completed | Vaginal Estradiol and Oral Guaifenesin in Clomiphene Ovulation Induction NCT07398924 | Yuzuncu Yil University | N/A |
| Unknown | New Protocol in Unexplained Infertility NCT04754243 | Tanta University | Phase 4 |
| Completed | Unexplained Infertility Treated by Hysteroscopy-laparoscopy NCT04465045 | University Hospital, Montpellier | — |
| Completed | Incremental Clomiphene Citrate Doses in Successive Cycles and FSH, LH and Steroid Hormone Levels NCT04210765 | Bagcilar Training and Research Hospital | Phase 4 |
| Completed | A Therapeutic Protocol in Previous Failed ART Patients With High Total NK Cells NCT03792997 | Benha University | Phase 2 |
| Completed | Uterine Scratching in Intra-Uterine Insemination NCT03828786 | Clinique Ovo | N/A |
| Unknown | Role of Routine Hysteroscopy in Management of Cases of Unexplained Infertility NCT03380364 | Ain Shams University | N/A |
| Completed | Assessment of Endometrial Thickness & Subendometrial Perfusion by 3D Power Doppler in Women With Unexplained I NCT03397693 | Assiut University | — |
| Unknown | Effect of Endometrial Injury in Couples With Unexplained Infertility NCT03398993 | Cairo University | N/A |
| Unknown | Using Microfluidic Separation Sperm Selection for Unexplained Infertility and Reccurrent Implantation Failure NCT03355937 | Acibadem University | N/A |
| Completed | Assessing the Endometrial Environment in Recurrent Pregnancy Loss and Unexplained Infertility NCT03401918 | Stanford University | Phase 2 |
| Unknown | A Study of Lidocaine Pertubation as a Treatment for Unexplained Infertility NCT03386552 | Isifer AB | Phase 2 |
| Completed | Serum Kisspeptin Levels in Infertile Women NCT03018314 | Bakirkoy Dr. Sadi Konuk Research and Training Hospital | — |
| Active Not Recruiting | Preovulatory Uterine Flushing With Saline as a Treatment for Unexplained Infertility NCT02539290 | CHU de Quebec-Universite Laval | N/A |
| Unknown | Acupuncture for Unexplained Subfertiliy NCT02624076 | Heilongjiang University of Chinese Medicine | N/A |
| Completed | Effect of Danazol on Endometrial αvβ3 Integrin Expression in Patients With Unexplained Recurrent Implantation NCT03563664 | Ain Shams University | Phase 3 |
| Completed | The Effects of Using Fertile Chip in Sperm Selection for Intracytoplasmic Sperm Injection in Unexplained Infer NCT02488434 | Baskent University | Phase 3 |
| Completed | The Effect of LMWH on ICSI in Patients With Unexplained Infertility and Negative Immunological Markers NCT02861105 | Ain Shams University | Phase 4 |
| Completed | Dual FSH/HCG Trigger in Letrozole Stimulated Intrauterine Insemination Cycles in Women With Unexplained Infert NCT02739516 | Benha University | Phase 3 |
| Completed | Uterine Flushing With Human Chorionic Gonadotrophin and Unexplained Infertility NCT03461601 | Ahmed Walid Anwar Murad | N/A |
| Completed | The Predictive Value of the Sperm Chromatin Dispersion Test, Halosperm®, Before and After Sperm Preparation fo NCT02235103 | University Hospital, Ghent | — |
| Unknown | Endometrial Scratching by Pipelle on Pregnancy Rate in Unexplained Infertility NCT02084914 | Ain Shams University | Phase 3 |
| Completed | Endometrial Injury in Women With Unexplained Infertility NCT02628756 | Mansoura Integrated Fertility Center | N/A |
| Completed | Nimodipine to Prevent LH Surge During Ovulation Induction: Blinded Placebo-controlled RCT NCT01672801 | Boston IVF | N/A |
| Completed | Swim up and Gradient Methods Used in Assisted Reproduction Techniques on DNA Fragmentation of Spermatozoa NCT01859520 | Gazi University | N/A |
| Completed | Endocrine Disrupting Chemicals: Potential Effects on Male and Female Reproductive Health in Saskatchewan NCT02272439 | University of Saskatchewan | — |
| Completed | Treg, Th17 Cells, NKT in Epithelial Ovarian Tumor NCT03779399 | Medical University of Lublin | — |
| Unknown | Unexplained Infertility Among Asthmatic and Atopic Patients NCT01788735 | Elisabeth Juul Gade | — |
| Unknown | Luteal Phase Support With Progesterone Versus Estrogen and Progesterone on Pregnancy Rates NCT01237535 | Rabin Medical Center | Phase 4 |
| Completed | Impact of Sperm DNA Integrity on In Vitro Cycles NCT01232465 | Northwell Health | — |
| Completed | Assessment of Multiple Intrauterine Gestations From Ovarian Stimulation NCT01044862 | Yale University | Phase 3 |
| Completed | Endometrial Scratch Injury in Women With Unexplained Infertility Undergoing IUI NCT02349750 | Cairo University | N/A |
| Terminated | Study of Oral Dehydroepiandrosterone(DHEA) to Treat Previously Unexplained Infertility NCT00650754 | Center for Human Reproduction | Phase 2 / Phase 3 |