2026 data ClinicalTrials.gov official source

Conditions: R

Compiled by PlainTrial Editorial, Clinical Trial Intelligence Editorial Team · January 1, 2026

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

1,694 conditions starting with "R"

Showing 1,401–1,450 of 1,694

Condition	Trials	Recruiting
Respiratory Viral Illnesses: Influenza A/B, RSV, Adenovirus	1	-
Respiratory Viral Infection	5	2
Respiratory Virus	2	2
Respiratory Virus Infection	1	1
Respiratory Virus Infections	1	1
Respiratory Viruses	1	1
Respiratory; Disorder, Functional, Impaired	1	-
Respite Care	1	-
Response of Fatty Acid Desaturation to Zinc Intake	1	1
Response To Dengue Exposure	1	-
Responses to Social Threat	1	1
Rest	1	-
Restenoses, Coronary	1	1
Restenosis	2	-
Resting Metabolic Rate	1	1
Resting Metabolism	1	-
Restless Leg Disorder	1	1
Restless Leg Syndrome	2	-
Restless Leg Syndrome (RLS)	3	3
Restless Legs Syndrome	15	1
Restless Legs Syndrome (RLS)	2	-
Restricted Behavior	2	1
Restrictive Cardiomyopathy	1	1
Restrictive Lung Disease	1	-
Resuscitation	3	3
Resuscitation of Newborn Training	1	-
RET Gene Mutation	1	-
RET-altered Non Small Cell Lung Cancer	1	1
RET-altered Solid Tumors	1	1
Retained Products of Conception	1	1
Retention Disorders, Cognitive	1	-
Retention in Care	4	2
Reticular Dysgenesis	1	-
Retina Condition Followed by Fluorescein Angiography Imaging	1	-
Retina Patients	1	1
Retina Vein Occlusion	1	-
Retina; Change	1	1
Retina; Detachment, Rhegmatogenous	1	1
Retinal Arterial Macroaneurysm	1	1
Retinal Artery Occlusions	1	1
Retinal Degeneration	18	8
Retinal Detachment	4	2
Retinal Disease	20	14
Retinal Diseases	9	3
Retinal Disorder	1	-
Retinal Drusen	1	-
Retinal Dystrophies	11	6
Retinal Dystrophy	4	1
Retinal Dystrophy Rod	1	-
Retinal Dystrophy Rod Progressive	1	-

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