| Endocrine, Metabolic, Cardiovascular and Immunological Aspects of Sex Chromosome Abnormalities in Relation to Genotype (NCT05425953) | University of Aarhus | 2022-06-13 |
| Parent and Infant Inter(X)Action Intervention (PIXI) (NCT03836300) | RTI International | 2018-11-30 |
| Unraveling the Klinefelter's Disease Physiopathology (NCT05997706) | Cliniques universitaires Saint-Luc- Université Catholique de Louvain | 2018-06-12 |
| TESTO: Testosterone Effects on Short-Term Outcomes in Infants With XXY (NCT03325647) | University of Colorado, Denver | 2017-11-06 |
| The eXtroardinarY Babies Study: Natural History of Health and Neurodevelopment in Infants and Young Children With Sex Chromosome Trisomy (NCT03396562) | University of Colorado, Denver | 2017-09-29 |
| Cardiometabolic Profiles of Boys With Klinefelter Syndrome (NCT02723305) | University of Colorado, Denver | 2016-05-01 |
| Fertility Assessment in Patients With Klinefelter Syndrome (NCT02461303) | University of Pittsburgh | 2016-01-07 |
| Expanded Noninvasive Genomic Medical Assessment: The Enigma Study (NCT02787486) | Progenity, Inc. | 2015-10-01 |
| Thrombosis and Neurocognition in Klinefelter Syndrome (NCT02526628) | University of Aarhus | 2015-09-01 |
| Body Composition in Infants With Klinefelter Syndrome and Effects of Testosterone Treatment (NCT02408445) | University of Colorado, Denver | 2015-05-08 |
| Klinefelter Fertility Preservation (NCT01817296) | Boston Children's Hospital | 2013-03-01 |
| TyG Index Levels in Klinefelter Syndrome (NCT05014997) | Gulhane School of Medicine | 2013-02-10 |
| X-chromosome Inactivation, Epigenetics and the Transcriptome (NCT01678261) | University of Aarhus | 2012-09-01 |
| Life Quality and Health in Patients With Klinefelter Syndrome (NCT01690013) | University of Aarhus | 2012-09-01 |
| Study of Psychological and Motor Effects of Testosterone in Adolescents With XXY/Klinefelter Syndrome (NCT01585831) | University of Colorado, Denver | 2012-03-01 |
| Human Chorionic Gonadotropin Stimulation Effects on Steroidogenesis in Men With Klinefelter Syndrome (NCT02788136) | Azienda USL Modena | 2012-02-01 |
| Fertility Preservation in Cases of Klinefelter Syndrome. (NCT01918280) | Hospices Civils de Lyon | 2010-09-20 |
| Subcapsular Orchiectomy in Men With Klinefelter Syndrome (NCT01750632) | Odense University Hospital | 2010-08-01 |
| Neuropsychologic, Neuroradiologic, Endocrinologic, and Genetic Aspects of Klinefelter Syndrome (NCT00999310) | University of Aarhus | 2009-11-01 |
| Androgen for Leydig Cell Proliferation (NCT01206270) | University of Roma La Sapienza | 2009-06-01 |
| Adaptation Among Adolescents and Adults With Klinefelter Syndrome (NCT00896272) | National Human Genome Research Institute (NHGRI) | 2009-05-05 |
| Thyroid Function and Structure in Klinefelter Syndrome (NCT05581147) | University of Roma La Sapienza | 2007-05-11 |
| Androgen Effect on Klinefelter Syndrome Motor Outcome (NCT00348946) | Thomas Jefferson University | 2006-07-01 |
| Adaptive Behavior Assessment of Men With 49, XXXXY, Klinefelter Syndrome (NCT00347464) | University of Wisconsin, Madison | 2006-06-01 |