2026 data ClinicalTrials.gov official source

Conditions: O

Every condition beginning with O that has a registered US clinical trial, with how many studies cover each.

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829 conditions starting with "O"

Showing 51–100 of 829

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Condition Trials
Obesity-Related Malignant Neoplasm 7
Obesity/Overweight 3
Obesity/Therapy 2
Obesity; Drug 1
Obesity; Endocrine 1
Obesity; Excess Calories 1
Obesity; Familial 1
Obliterative Bronchiolitis 1
Obscure Gastrointestinal Bleeding 1
Observation Safety 1
Obsessive - Compulsive Disorder 86
Obsessive Compulsive Disorder (OCD) 13
Obsessive-Compulsive Disorder in Adolescence 2
Obsessive-Compulsive Disorder in Children 3
Obsessive-compulsive Disorders and Symptoms 1
Obstetric Care 2
Obstetric Complication 1
Obstetric Labor 1
Obstetric Labor Complications 4
Obstetric Labor, Premature 4
Obstetric Labour, Premature 2
Obstetric Pain 3
Obstetric Trauma 1
Obstetric; Injury 2
Obstetrical Complications 3
Obstetrics 1
Obstructive 1
Obstructive Airway Disease 1
Obstructive Apnea 1
Obstructive Apnea of Newborn 1
Obstructive Cardiomyopathy, Hypertrophic 1
Obstructive Defecation Syndrome 1
Obstructive Hypertrophic Cardiomyopathy 4
Obstructive Hypertrophic Cardiomyopathy (oHCM) 2
Obstructive Lung Disease 1
Obstructive Pulmonary Disease 2
Obstructive Sleep Apnea 157
Obstructive Sleep Apnea (OSA) 13
Obstructive Sleep Apnea (OSAS) 1
Obstructive Sleep Apnea (SAOS) 1
Obstructive Sleep Apnea Hypopnea 1
Obstructive Sleep Apnea of Adult 9
Obstructive Sleep Apnea of Child 1
Obstructive Sleep Apnea Syndrome 2
Obstructive Sleep Apnea/Hypopnea Syndrome (OSAHS) 1
Obtain Diagnostic Images With the New Digital Camera and Image Processor for Evaluation. 1
Occipital Horn Syndrome 1
Occipital Lobe Infarct 3
Occipital Neuralgia 3
Occlusal Changes 1

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Data sourced from official public datasets. See our methodology for details.