Browse by Phase
N/A (Early Phase / Not Applicable) Clinical Trials
Browse currently recruiting N/A (Early Phase / Not Applicable) clinical trials registered on ClinicalTrials.gov.
Total Trials
6,814
Recruiting Now
6,814
Top Conditions in N/A (Early Phase / Not Applicable)
Frequently Asked Questions — N/A (Early Phase / Not Applicable) Trials
What does "N/A" mean for a clinical trial phase?
"N/A" or "Not Applicable" in the phase field indicates the trial does not follow the traditional Phase 1–4 drug development pathway. This applies to observational studies, epidemiological research, behavioral interventions, device studies, or exploratory work not yet assigned a formal phase. These studies are still registered on ClinicalTrials.gov and follow IRB-approved protocols.
Are N/A phase trials safe to participate in?
N/A phase trials encompass a wide range of study types, many involving minimal risk—such as observational studies, questionnaire-based research, or registry enrollment. Some may involve investigational devices or early-stage interventions. Review the trial's protocol, risks and benefits section, and informed consent documents carefully before enrolling. All ClinicalTrials.gov-registered studies must comply with applicable safety oversight requirements.
How do I find N/A phase trials for my condition?
Browse ClinicalMetric by condition to find all trials—regardless of phase—that are recruiting for a specific disease. Many N/A phase trials are observational or behavioral studies with fewer eligibility restrictions than phase-designated drug trials, making them more accessible to a broader range of participants.
Active N/A (Early Phase / Not Applicable) Studies
NCT07215689 N/A
Recruiting
Effects of KSM-66 Ashwagandha® (300 mg) on Skin and Hair Health in Healthy Men a...
Condition
Skin Health
Enrollment
50 pts
Location
United States
Sponsor
SF Research Institute, Inc.
NCT07428291 N/A
Recruiting
Early Rehabilitationin in Tibial Spine Avulsion Fracture Managed With Arthoscopi...
Condition
Avulsion Fracture
Enrollment
56 pts
Location
Pakistan
Sponsor
Abdul Jabbar
NCT07413718 N/A
Recruiting
Inspiratory Muscle Training in Amiotrophyc Lateral Sclerosis
Condition
Amyotrophic Lateral Slerosis
Enrollment
44 pts
Location
Spain
Sponsor
University Ramon Llull
NCT06330090 N/A
Recruiting
COgnitive Dynamics in Early Childhood
Condition
Cognitive Change
Enrollment
600 pts
Location
Netherlands
Sponsor
Radboud University Medical Cen
NCT07562997 N/A
Recruiting
Sodium and Milk Fortification Evaluation of Body Composition Among Very Preterm ...
Condition
Very Preterm and Extremely Preterm Birth
Enrollment
150 pts
Location
United States
Sponsor
University of Washington
NCT06361420 N/A
Recruiting
Driving Pressure-guided Lung Protective Ventilation
Condition
Hypoxemia
Enrollment
43 pts
Location
China
Sponsor
Yong Lin, PhD
NCT05766059 N/A
Recruiting
Novel Non-invasive Brain Stimulation Techniques in Neurological Rehabilitation
Condition
Stroke
Enrollment
36 pts
Location
Italy
Sponsor
Istituto Auxologico Italiano
NCT06184880 N/A
Recruiting
Effect of Physical Activity Program on Sedentary of Patients With Upper Aerodige...
Condition
Upper Aerodigestive Tract Cancer
Enrollment
96 pts
Location
France
Sponsor
Centre Hospitalier de Valence
NCT05407480 N/A
Recruiting
Thereapeutic Recommendantion for Children With a Hodgkin Lymphoma
Condition
Staging
Enrollment
250 pts
Location
France
Sponsor
French Africa Pediatric Oncolo
NCT06249880 N/A
Recruiting
Pediatric Normative Markerless Movement Analysis
Condition
Pediatric ALL
Enrollment
40 pts
Location
United States
Sponsor
MultiCare Health System Resear
NCT06698679 N/A
Recruiting
The Association Between Plasma Metabolites and the Risk, Efficacy and Prognosis ...
Condition
Breast Cancer
Enrollment
1,000 pts
Location
China
Sponsor
Shengjing Hospital
NCT07481396 N/A
Recruiting
Molecular Insights Into Post-Cardiac Arrest Brain Injury Via CSF Multi-Omics
Condition
Cardiac Arrest (CA)
Enrollment
60 pts
Location
South Korea
Sponsor
Chungnam National University H
NCT07643896 N/A
Recruiting
The ADVANCE (Assay Development and Validation for Pre-Natal and Obstetric Condit...
Condition
Pregnant Individuals
Enrollment
1,000 pts
Location
United States
Sponsor
BillionToOne Inc.
NCT07457762 N/A
Recruiting
AIRDROP: Can we Improve Adherence to Inhaled Treatment for Pulmonary Arterial Hy...
Condition
Pulmonary Arterial Hypertension (PAH)
Enrollment
72 pts
Location
Brazil
Sponsor
University of Sao Paulo Genera
NCT06788262 N/A
Recruiting
Cerebral and Cognitive Impact of Female Professional SoccerPractice
Condition
Traumatic Chronic Encephalopathy
Enrollment
80 pts
Location
France
Sponsor
University Hospital, Strasbour
NCT06547788 N/A
Recruiting
LEFT ATRIAL MONITORING IN PATIENTS BEFORE AND AFTER MITRAL SURGERY - LAMBDA STUD...
Condition
Mitral Regurgitation
Enrollment
50 pts
Location
Canada
Sponsor
Ottawa Heart Institute Researc
NCT06174103 N/A
Recruiting
BiVACOR® Total Artificial Heart Early Feasibility Study
Condition
Heart Failure
Enrollment
20 pts
Location
United States
Sponsor
BiVACOR Inc.
NCT06184503 N/A
Recruiting
Analysis of Velmanase Alfa (Lamzede®)'s Effects in the Body of Children With Alp...
Condition
Alpha-Mannosidosis
Enrollment
5 pts
Location
United States
Sponsor
Chiesi Farmaceutici S.p.A.
NCT06788873 N/A
Recruiting
Comparison of Cervical Cerclage by Vaginal and by Laparoscopic Transabdominal Ro...
Condition
Cerclage, Cervical
Enrollment
60 pts
Location
Italy
Sponsor
IRCCS Azienda Ospedaliero-Univ
NCT05378841 N/A
Recruiting
Efficacy of Surgical Joint Denervation in Painful Digital Osteoarthritis
Condition
Osteoarthritis Hand
Enrollment
19 pts
Location
France
Sponsor
Assistance Publique - Hôpitaux
NCT06777017 N/A
Recruiting
Can Hepatic-splenic Elastography Predict the Risk of Hepatocellular Recurrence A...
Condition
HCC - Hepatocellular Carcinoma
Enrollment
50 pts
Location
Italy
Sponsor
IRCCS Azienda Ospedaliero-Univ
NCT05489068 N/A
Recruiting
Motivational Interviewing at Intake vs Intake as Usual on Client Engagement in A...
Condition
Substance-Related Disorders
Enrollment
150 pts
Location
United States
Sponsor
University of New Mexico
NCT06552091 N/A
Recruiting
Guided Digital Self-Hypnosis Solution for Managing Hot Flashes in Patients Under...
Condition
Breast Cancer Female
Enrollment
76 pts
Location
France
Sponsor
Institut de Cancérologie de Lo
NCT05358574 N/A
Recruiting
PMCF Study on the Safety, Performance and Clinical Benefits Data of the Anatomic...
Condition
Revision of a Shoulder Prosthesis
Enrollment
40 pts
Location
Germany
Sponsor
Zimmer Biomet
NCT05389410 N/A
Recruiting
PICO 7 vs PICO 14 in Revision Hip and Revision Knee Surgery.
Condition
Surgical Wound
Enrollment
164 pts
Location
United Kingdom
Sponsor
Robert Jones and Agnes Hunt Or
Page 1 of 273 — 6,814 trials total
ClinicalMetric — Independent clinical trial intelligence platform. Not affiliated with NIH, ClinicalTrials.gov, the U.S. FDA, or any pharmaceutical company, hospital, or clinical research organization. Trial data is sourced from ClinicalTrials.gov for informational purposes only and does not constitute medical advice. Do not make any treatment, enrollment, or health decisions based solely on information found here — always consult a qualified healthcare professional. Full Disclaimer · Last Reviewed: November 2026 · Data Methodology