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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Urea Cycle Disorder Clear all
Completed Not applicable Interventional

Nitric Oxide Supplementation in Argininosuccinic Aciduria

NCT02252770
View directory record Official record
Conditions
Argininosuccinic Aciduria, Argininosuccinate Lyase Deficiency, Urea Cycle Disorders
Interventions
Nitric oxide supplement, Placebo
Dietary Supplement
Lead sponsor
Baylor College of Medicine
Other
Eligibility
8 Years to 64 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 17, 2020 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Neurologic Injuries in Adults With Urea Cycle Disorders

NCT00472732
View directory record Official record
Conditions
Brain Diseases, Metabolic, Inborn, Urea Cycle Disorder, Ornithine Transcarbamylase Deficiency
Interventions
Not listed
Lead sponsor
Andrea Gropman
Other
Eligibility
18 Years to 60 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
2
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jun 23, 2015 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

A Study to Assess Plasma Ammonia Time-Normalized Area Under the Curve and Rate of Ureagenesis in Healthy Adult Subjects

NCT04269122
View directory record Official record
Conditions
Ornithine Transcarbamylase Deficiency
Interventions
No Intervention
Other
Lead sponsor
Ultragenyx Pharmaceutical Inc
Industry
Eligibility
18 Years to 55 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Mar 29, 2020 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated No phase listed Observational Results available

Observational Study That Will Collect Information on Patients With Urea Cycle Disorders (UCDs)

NCT01948427
View directory record Official record
Conditions
Urea Cycle Disorder
Interventions
Not listed
Lead sponsor
Amgen
Industry
Eligibility
Not listed
Enrollment
203 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2020
U.S. locations
1
States / cities
Blue Bell, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 30, 2024 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational Results available

Observational Study of OCT in a Patients Undergoing FFR

NCT01663896
View directory record Official record
Conditions
Coronary Artery Disease
Interventions
OCT stent guidance
Device
Lead sponsor
Abbott Medical Devices
Industry
Eligibility
18 Years and older
Enrollment
418 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
15
States / cities
Birmingham, Alabama • La Jolla, California • Orlando, Florida + 12 more
Source: ClinicalTrials.gov public record
Updated Jul 1, 2020 · Synced Sep 24, 2026, 7:46 AM EDT
Recruiting No phase listed Observational

Hepatic Histopathology in Urea Cycle Disorders

NCT04908319
View directory record Official record
Conditions
Urea Cycle Disorder, Ornithine Transcarbamylase Deficiency, Citrullinemia 1, ARGI Deficiency, ASL Deficiency, Argininosuccinic Aciduria, ASS Deficiency, Hyperargininemia, Carbamyl Phosphate Synthetase Deficiency, NAGS Deficiency
Interventions
Not listed
Lead sponsor
Baylor College of Medicine
Other
Eligibility
Not listed
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 19, 2025 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational Results available

Chronic Liver Disease in Urea Cycle Disorders

NCT03721367
View directory record Official record
Conditions
Urea Cycle Disorder
Interventions
Diagnostic Ultrasound
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
5 Years to 60 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 9, 2023 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational

Age-related Macular Degeneration: Detection of Onset of New Choroidal Neovascularization (AMD DOC Study)

NCT00417846
View directory record Official record
Conditions
Maculopathy, Age-Related, Choroidal Neovascularization
Interventions
Not listed
Lead sponsor
Johns Hopkins University
Other
Eligibility
50 Years and older
Enrollment
98 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
4
States / cities
Beverly Hills, California • Baltimore, Maryland • Boston, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 4, 2009 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational

Pilot Study: Urea Cycle Disorders Practice Patterns and Outcomes Assessment

NCT02311283
View directory record Official record
Conditions
Urea Cycle Disorders
Interventions
Not listed
Lead sponsor
University of South Florida
Other
Eligibility
Not listed
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Mar 6, 2018 · Synced Sep 24, 2026, 7:46 AM EDT
Recruiting No phase listed Observational

Abbott Vascular Medical Device Registry

NCT04573660
View directory record Official record
Conditions
Acute Myocardial Infarction, Restenoses, Coronary, Coronary Artery Lesions, Venous Embolism, Arterial Embolism
Interventions
Coronary and peripheral stents, Pacing catheters, Vascular plugs, Measurement and imaging (FFR and OCT), Peripheral dilatation catheters, Coronary dilatation catheters, Coronary and peripheral guidewires, Vessel closure/compression devices, Vascular access introducers
Device
Lead sponsor
Abbott Medical Devices
Industry
Eligibility
18 Years and older
Enrollment
3,784 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2031
U.S. locations
7
States / cities
Birmingham, Alabama • Little Rock, Arkansas • Los Angeles, California + 4 more
Source: ClinicalTrials.gov public record
Updated Jul 2, 2025 · Synced Sep 24, 2026, 7:46 AM EDT
Active, not recruiting No phase listed Observational

Liver Disease in Urea Cycle Disorders

NCT04612764
View directory record Official record
Conditions
Urea Cycle Disorder, Ornithine Transcarbamylase Deficiency, Citrullinemia 1, ARGI Deficiency, ASL Deficiency, Argininosuccinic Aciduria, ASS Deficiency, Hyperargininemia
Interventions
Not listed
Lead sponsor
Baylor College of Medicine
Other
Eligibility
6 Years to 65 Years
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
5
States / cities
Aurora, Colorado • Washington D.C., District of Columbia • Philadelphia, Pennsylvania + 2 more
Source: ClinicalTrials.gov public record
Updated Apr 26, 2026 · Synced Sep 24, 2026, 7:46 AM EDT
Completed Phase 2 Interventional

Pilot Study For Hypothermia Treatment In Hyperammonemic Encephalopathy In Neonates And Very Young Infants

NCT01624311
View directory record Official record
Conditions
Urea Cycle Disorders, Organic Acidemias
Interventions
Therapeutic Hypothermia, Standard of Care Therapy
Other
Lead sponsor
Uta Lichter-Konecki
Other
Eligibility
1 Day to 30 Days
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
3
States / cities
Washington D.C., District of Columbia • New York, New York • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated May 31, 2015 · Synced Sep 24, 2026, 7:46 AM EDT
Recruiting Phase 3 Interventional

An Open-label Study to Investigate ECUR-506 in Male Babies Less Than 9 Months of Age With Neonatal Onset OTC Deficiency

NCT06255782
View directory record Official record
Conditions
Ornithine Transcarbamylase Deficiency, Ornithine Transcarbamylase Deficiency Disease, Ornithine Carbamoyltransferase Deficiency (Disorder), Urea Cycle Disorders, Inborn
Interventions
ECUR-506
Genetic
Lead sponsor
iECURE, Inc.
Industry
Eligibility
24 Hours to 7 Months · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
6
States / cities
Los Angeles, California • Aurora, Colorado • Atlanta, Georgia + 3 more
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Sep 24, 2026, 7:46 AM EDT
Completed No phase listed Observational

Valproic Acid-associated Hypoalbuminemia in Medically Fragile Patients

NCT00723762
View directory record Official record
Conditions
Hypoalbuminemia
Interventions
Specimen collection
Procedure
Lead sponsor
Akron Children's Hospital
Other
Eligibility
Not listed
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Mantua, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 9, 2011 · Synced Sep 24, 2026, 7:46 AM EDT
Recruiting Phase 1Phase 2 Interventional

Study of LNP.UCD.ABE in Patients With Urea Cycle Disorders

NCT07667387
View directory record Official record
Conditions
Urea Cycle Disorders, Carbamoyl-Phosphate Synthase I Deficiency
Interventions
LNP.UCD.ABE
Biological
Lead sponsor
Rebecca Ahrens-Nicklas
Other
Eligibility
24 Hours to 5 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated Phase 1 Interventional

Hepatocyte Transplantation for Liver Based Metabolic Disorders

NCT01345578
View directory record Official record
Conditions
Metabolic Diseases
Interventions
human hepatocyte transplantation, Preparative Radiation Therapy
Drug · Radiation
Lead sponsor
Ira Fox
Other
Eligibility
Up to 21 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2022
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 6, 2022 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated No phase listed Observational

Oxidative Stress, Inflammation and Acute Decompensation in Urea Cycle Disorders

NCT01541722
View directory record Official record
Conditions
Urea Cycle Disorders
Interventions
Not listed
Lead sponsor
Mark Batshaw
Other
Eligibility
Not listed
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
10
States / cities
Los Angeles, California • Aurora, Colorado • Washington D.C., District of Columbia + 7 more
Source: ClinicalTrials.gov public record
Updated Oct 1, 2015 · Synced Sep 24, 2026, 7:46 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study Investigating the Pharmacokinetic Profiles of Four Extended Release Paracetamol Formulations

NCT01568749
View directory record Official record
Conditions
Analgesia
Interventions
Paracetamol, Paracetamol formulation 1, Paracetamol Formulation 2, Paracetamol formulation 3, Paracetamol formulation 4
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 50 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 23, 2014 · Synced Sep 24, 2026, 7:46 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Study of Treatment and Metabolism in Patients With Urea Cycle Disorders

NCT00004307
View directory record Official record
Conditions
Amino Acid Metabolism, Inborn Errors
Interventions
Protein and calorie controlled diet, Ornithine transcarbamylase vector
Behavioral · Genetic
Lead sponsor
National Center for Research Resources (NCRR)
NIH
Eligibility
6 Months to 64 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 1999
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated No phase listed Observational

Study to Characterize Rate of Ureagenesis in Patients With Ornithine Transcarbamylase (OTC) Deficiency

NCT04717453
View directory record Official record
Conditions
Ornithine Transcarbamylase Deficiency
Interventions
No Intervention
Other
Lead sponsor
Ultragenyx Pharmaceutical Inc
Industry
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Feb 17, 2022 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

The NIH UNI Study: Urea Cycle Disorders, Nutrition and Immunity

NCT01421888
View directory record Official record
Conditions
Argininosuccinic Aciduria, Carbamoyl-Phosphate Synthase I Deficiency, Citrullinemia, Ornithine Carbamoyltransferase Deficiency, Hyperargininemia, N-Acetylglutamate Synthase Deficiency
Interventions
Not listed
Lead sponsor
National Human Genome Research Institute (NHGRI)
NIH
Eligibility
2 Years to 99 Years
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 8, 2019 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated Phase 2 Interventional

UNLOCKED: A Phase 2, Open-label Trial With KB195 in Subjects With a Urea Cycle Disorder

NCT03933410
View directory record Official record
Conditions
Urea Cycle Disorder
Interventions
KB195
Drug
Lead sponsor
Kaleido Biosciences
Industry
Eligibility
18 Years to 65 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
6
States / cities
Washington D.C., District of Columbia • Tampa, Florida • Baltimore, Maryland + 3 more
Source: ClinicalTrials.gov public record
Updated Jan 24, 2022 · Synced Sep 24, 2026, 7:46 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Functional Evaluation in Patients With Urea Cycle Disorders (UCD) During a Driving Task

NCT07701694
View directory record Official record
Conditions
Urea Cycle Disorder
Interventions
Not listed
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
16 Years to 40 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2032
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 30, 2026 · Synced Sep 24, 2026, 7:46 AM EDT
Terminated No phase listed Observational

Adeno-Associated Virus (AAV) Antibody Study in Subjects OTC Deficiency, GSDIa, and Wilson Disease

NCT04909346
View directory record Official record
Conditions
Ornithine Transcarbamylase Deficiency, Wilson Disease, Glycogen Storage Disease Type IA
Interventions
Not listed
Lead sponsor
Ultragenyx Pharmaceutical Inc
Industry
Eligibility
18 Years and older
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Akron, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 11, 2023 · Synced Sep 24, 2026, 7:46 AM EDT