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 1,551–1,600 of 1,694

Condition	Trials	Recruiting
Rib Trauma	2	-
Richter Syndrome	13	5
Richter Transformation	2	2
Richter Transformation Lymphoma	2	-
Richter's Syndrome	2	-
Richter's Transformation	2	1
Ridge Augmentation	2	2
Ridge Deficency	1	-
Ridge Preservation	3	1
Riding With Driver Under the Influence	1	-
Rift Valley Fever	3	2
Right Bundle-Branch Block	1	1
Right Heart Dysfunction	1	1
Right Heart Failure	5	3
Right Heart Failure Due to Left Heart Failure	1	1
Right Sided Heart Failure With Normal Ejection Fraction	1	-
Right Ventricle	1	-
Right Ventricular (RV) Dysfunction	1	1
Right Ventricular Arrhythmogenic Cardiomyopathy	1	1
Right Ventricular Dysfunction	6	3
Right Ventricular Overload	1	-
Right-To-Left Shunt	1	1
Rigid Spine Muscular Dystrophy	1	1
Rising Prostate Specific Antigen (PSA)	1	-
Risk	2	-
Risk Assessment	2	2
Risk Behavior	9	2
Risk Behavior, Health	2	1
Risk Communication	1	1
Risk Factor, Cardiovascular	1	-
Risk Factors	1	1
Risk Factors for or a Diagnosis of Osteoporosis	1	-
Risk for an Alcohol-Exposed Pregnancy	1	1
Risk for Colorectal Cancer	1	-
Risk for Marijuana-Exposed Pregnancy	1	1
Risk for Substance-Exposed Pregnancy	1	1
Risk Management	1	-
Risk of Coronary Obstruction Following Transcatheter Aortic Valve Replacement (TAVR) Procedure	1	-
Risk of Premature Ovarian Failure	1	1
Risk Reduction	14	2
Risk Reduction Behavior	10	2
Risk-Taking	2	1
Risky Behavior	1	1
Risky Health Behavior	4	4
Risky Sexual Behavior	1	1
Risky Substance Use	1	1
RISS Stage I Plasma Cell Myeloma	1	1
RISS Stage II Plasma Cell Myeloma	1	1
Rivaroxaban	1	1
RNA	2	1

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