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| Adult Living Donor Liver Transplantation Studies | A2ALL | Liver Disease | Data Available for Request | Specimens Available for Request | |
| Acute Liver Failure Study Group: Adult Acute Liver Failure Study | AALF | Liver Disease | Data Available for Request | Specimens Available for Request | Acute Liver Failure Study Group (ALFSG) |
| African American Study of Kidney Disease and Hypertension Cohort Study | AASK Cohort | Kidney Disease; Multidisciplinary Research | Data Available for Request | Specimens Available for Request | African American Study of Kidney Disease Study Group (AASK) |
| African American Study of Kidney Disease and Hypertension Study (Clinical Trial) | AASK Trial | Multidisciplinary Research; Kidney Disease | Data Available for Request | Specimens Available for Request | African American Study of Kidney Disease Study Group (AASK) |
| NIDDK Reference Calibrators for Islet Autoantibody Measurements | AAb Calibrators | Diabetes | Data Not Available | Specimens Available for Request | |
| A Cohort Study to Investigate the Value of Exercise in ESRD/Analyses Designed to Investigate the Paradox of Obesity and Survival in ESRD | ACTIVE/ADIPOSE | Multidisciplinary Research; Obesity; Kidney Disease | Data Available for Request | Specimens Available for Request | |
| Autosomal Dominant Polycystic Kidney Disease Genetic Modifier Study | ADPKD | Kidney Disease | Data Expected | Specimens Require Collaboration with Parent Study | |
| Assessing Long Term Outcomes in Living Kidney Donors | ALTOLD | Kidney Disease | Data Available for Request | Specimens Not Available | |
| Aprepitant for the Relief of Nausea in Patients With Chronic Nausea and Vomiting of Presumed Gastric Origin Trial | APRON | Digestive Diseases | Data Available for Request | Specimens Available for Request | Gastroparesis Clinical Research Consortium (GpCRC) |
| Assessment, Serial Evaluation, and Subsequent Sequelae in Acute Kidney Injury | ASSESS-AKI | Kidney Disease | Data Available for Request | Specimens Available for Request | |
| Acute Renal Failure Trial Network | ATN | Kidney Disease | Data Available for Request | Specimens Not Available | |
| Boston Area Community Health Survey | BACH | Urologic Diseases | Data Available for Request | Specimens Not Available | |
| Biliary Atresia Research Consortium | BARC | Liver Disease | Data Available for Request | Specimens Require Collaboration with Parent Study | ChiLDReN Network (ChiLDReN) |
| Bicarbonate Administration to Stabilize Estimated Glomerular Filtration Rate (eGFR) | BASE | Kidney Disease | Data Available for Request | Specimens Available for Request | Chronic Kidney Disease Consortium (CKD) |
| Biliary Atresia Study in Infants and Children | BASIC | Liver Disease | Data Available for Request | Specimens Require Collaboration with Parent Study | ChiLDReN Network (ChiLDReN) |
| Behavior Enhances Drug Reduction of Incontinence | BE-DRI | Urologic Diseases | Data Available for Request | Specimens Not Available | Urinary Incontinence Research Network (UITN) |
| Beta Cell Restoration Through Fat Mitigation | BetaFat | Multidisciplinary Research; Diabetes; Obesity | Data Available for Request | Specimens Available for Request | The RISE Consortium (RISE) |
| Complementary and Alternative Medicine for Urological Symptoms | CAMUS | Urologic Diseases | Data Available for Request | Specimens Available for Request | |
| Comprehensive Dialysis Study | CDS | Multidisciplinary Research; Kidney Disease; Nutrition | Data Available for Request | Specimens Available for Request | |
| Prediction by Ultrasound of the Risk of Hepatic Cirrhosis in Cystic Fibrosis Liver Disease | CFLD PUSH | Pancreatic Disease; Multidisciplinary Research; Liver Disease | Data Available for Request | Specimens Require Collaboration with Parent Study | ChiLDReN Network (ChiLDReN) |
| Safety and Effectiveness of Low Molecular Weight Sulfated Dextran in Islet Transplantation | CIT-01 | Diabetes | Data Available for Request | Specimens Not Available | Clinical Islet Transplantation Consortium (CITC) |
| Strategies to Improve Long Term Islet Graft Survival and Extended Follow Up after Islet Transplantation in Type 1 Diabetes | CIT-02/08 | Diabetes | Data Available for Request | Specimens Available for Request | Clinical Islet Transplantation Consortium (CITC) |
| Peritransplant Deoxyspergualin in Islet Transplantation in Type 1 Diabetes and Extended Follow Up after Islet Transplantation in Type 1 Diabetes | CIT-03/08 | Diabetes | Data Available for Request | Specimens Available for Request | Clinical Islet Transplantation Consortium (CITC) |
| Islet Transplantation in Type 1 Diabetes with LEA29Y (Belatacept) Maintenance Therapy | CIT-04/08 | Diabetes | Data Available for Request | Specimens Available for Request | Clinical Islet Transplantation Consortium (CITC) |
| B-Lymphocyte Immunotherapy in Islet Transplantation: Toward Calcineurin-Inhibitor Free Immunosuppression | CIT-05/08 | Diabetes | Data Available for Request | Specimens Available for Request | Clinical Islet Transplantation Consortium (CITC) |
| Islet Transplantation in Type 1 Diabetic Kidney Allograft Recipients: Efficacy of Islet After Kidney Transplantation | CIT-06/08 | Diabetes | Data Available for Request | Specimens Available for Request | Clinical Islet Transplantation Consortium (CITC) |
| Islet Transplantation in Type 1 Diabetes | CIT-07/08 | Diabetes | Data Available for Request | Specimens Available for Request | Clinical Islet Transplantation Consortium (CITC) |
| CKD Biomarkers Consortium | CKD Biocon | Kidney Disease | Data Not Available | Specimens Not Available | |
| The Chronic Kidney Disease in Children Cohort Study | CKiD | Multidisciplinary Research; Kidney Disease | Data Available for Request | Specimens Available for Request | |
| Cholestatic Liver Disease Consortium | CLiC | Liver Disease | Data Not Available | Specimens Require Collaboration with Parent Study | ChiLDReN Network (ChiLDReN) |
| The CKD Optimal Management With BInders and NicotinamidE | COMBINE | Kidney Disease; Multidisciplinary Research | Data Available for Request | Specimens Available for Request | Chronic Kidney Disease Consortium (CKD) |
| Caring for OutPatiEnts after Acute Kidney Injury | COPE-AKI | Kidney Disease | Data Expected | Specimens Expected | |
| Clinical Outcomes Research Initiative | CORI | Multidisciplinary Research; Digestive Diseases; Pancreatic Disease | Data Available for Request | Specimens Not Available | |
| Chronic Prostatitis Collaborative Research Network Cohort Study | CPCRN Cohort | Urologic Diseases | Data Available for Request | Specimens Not Available | Chronic Prostatitis Collaborative Research Network (CPCRN) |
| Chronic Prostatitis Collaborative Research Network Clinical Trial - Ciprofloxacin and Tamsulosin | CPCRN RCT #1 | Urologic Diseases | Data Available for Request | Specimens Not Available | Chronic Prostatitis Collaborative Research Network (CPCRN) |
| Chronic Prostatitis Collaborative Research Network Clinical Trial - Alfuzosin | CPCRN2 RCT#1 | Urologic Diseases | Data Available for Request | Specimens Not Available | Chronic Prostatitis Collaborative Research Network (CPCRN) |
| Chronic Prostatitis Collaborative Research Network Clinical Trial - Pregabalin | CPCRN2 RCT#2 | Urologic Diseases | Data Available for Request | Specimens Not Available | Chronic Prostatitis Collaborative Research Network (CPCRN) |
| Chronic Renal Insufficiency Cohort Study | CRIC | Diabetes; Kidney Disease; Multidisciplinary Research | Data Available for Request | Specimens Available for Request | |
| Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease | CRISP | Kidney Disease | Data Available for Request | Specimens Available for Request | |
| Careful Urinary Tract Infection Evaluation | CUTIE | Kidney Disease; Multidisciplinary Research; Urologic Diseases | Data Available for Request | Specimens Available for Request | |
| ChiLDReN Genetic Collection Protocol | ChiLDReN-Genetics | Liver Disease; Multidisciplinary Research; Endocrine Diseases and Metabolic Diseases | Data Expected | Specimens Require Collaboration with Parent Study | ChiLDReN Network (ChiLDReN) |
| Cure Glomerulonephropathy | CureGN | Kidney Disease | Data Available for Request | Specimens Require Collaboration with Parent Study | |
| Cysteamine Bitartrate Delayed-Release for the Treatment of Nonalcoholic Fatty Liver Disease (NAFLD) in Children | CyNCh | Liver Disease | Data Available for Request | Specimens Available for Request | Nonalcoholic Steatohepatitis Clinical Research Network (NASH) |
| Diabetes Autoimmunity Study in the Young | DAISY | Diabetes | Data Available for Request | Specimens Not Available | |
| Diabetes Control and Complications Trial / Epidemiology of Diabetes Interventions and Complications | DCCT/EDIC | Kidney Disease; Diabetes; Multidisciplinary Research | Data Available for Request | Specimens Available for Request | |
| The International Diabetes Closed Loop (iDCL) Trial: Clinical Acceptance of the Artificial Pancreas | DCLP3 | Diabetes | Data Not Available | Specimens Not Available | |
| The International Diabetes Closed Loop (iDCL) Trial: Clinical Acceptance of the Artificial Pancreas in Pediatrics - A Study of t:slim X2 with Control-IQ Technology | DCLP5 | Diabetes | Data Not Available | Specimens Not Available | |
| DILIN: Prospective | DILIN Pro | Liver Disease | Data Available for Request | Specimens Available for Request | Drug-Induced Liver Injury Network (DILIN) |
| DILIN: Retrospective | DILIN Retro | Liver Disease | Data Available for Request | Specimens Available for Request | Drug-Induced Liver Injury Network (DILIN) |
| Diabetes Prevention Program | DPP | Diabetes; Nutrition; Multidisciplinary Research; Obesity | Data Available for Request | Specimens Available for Request |