How to Start a Clinical Trial: Key Steps and Best Practices

Written by
Florentin Ory
Published on
May 29, 2026

Launching a clinical trial requires thorough preparation. Before recruiting the first patient, teams must define a clear protocol, obtain regulatory approvals, and select the right research sites. By following a structured process, organizations significantly increase their chances of conducting a study on time, safely, and with usable data.

The Importance of Clinical Research

Clinical trials are used to evaluate the safety, performance, or effectiveness of a drug, medical device, diagnostic tool, or healthcare intervention before or after it reaches the market.

Every study is based on an approved protocol that defines the objectives, study population, evaluation criteria, data collection methods, and participant follow up procedures.

Without this phase, no therapeutic innovation can reach the market within a controlled framework. Clinical research generates actionable data, documents benefits and risks, and supports regulatory, medical, and scientific decision making.

What Are the First Steps in Launching a Clinical Trial?

Starting a study relies on several fundamental actions that must be carried out in a specific order:

  • Define the protocol: The protocol describes the study objectives, inclusion and exclusion criteria, follow up duration, treatments or devices being evaluated, planned visits, evaluation criteria, and analysis methods. It is the central document of the trial. It serves as the primary reference for investigators, research sites, regulatory authorities, ethics committees, and data management teams.
  • Build the study team:

A clinical study involves multiple stakeholders:

  • Principal Investigator
  • Clinical Project Managers
  • Clinical Research Associates (CRAs)
  • Data Managers
  • Biostatisticians
  • Regulatory Affairs Specialists
  • Quality Teams
  • Support Teams or Site Coordinators

Roles and responsibilities must be clearly defined before study startup to avoid ambiguity during trial execution.

  • Identify research sites: Each research site must have the infrastructure and expertise required to enroll and manage participants under appropriate conditions.
  • Prepare essential documents:

Before study startup, teams must prepare the documents required to conduct the trial:

  • Protocol
  • Informed Consent Form
  • Investigator’s Brochure or Product Documentation
  • Monitoring Plan
  • Data Management Plan
  • Training Materials
  • Safety Procedures
  • Site Contracts
  • Patient Materials, if applicable

These documents must remain consistent with one another. Any discrepancy between the protocol, the eCRF, informed consent documentation, or site procedures can create deviations from the very beginning of the study.

  • Obtain ethics committee approval:
    Any study involving participants must be reviewed by an appropriate ethics committee according to the country where the trial is conducted. Depending on the region, this may include:
  • An IRB, Institutional Review Board, in the United States
  • A CPP, Comité de Protection des Personnes, in France
  • An Ethik Kommission in Germany
  • A national or local ethics committee in other countries

This review helps ensure participant protection, scientific relevance, and the quality of information provided before informed consent is obtained.

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How to Prepare Regulatory Compliance for a Clinical Trial

The regulatory framework depends on the type of study, the product being evaluated, and the countries involved. A drug trial, a clinical investigation of a medical device, an IVD performance study, an observational study, or a post market study do not follow the same requirements.

Before study startup, the sponsor must identify the applicable regulations, competent authorities, relevant ethics committees, and required submission documents.

For Drug Clinical Trials

In the United States, certain trials involving investigational drugs require the submission of an IND, or Investigational New Drug Application, to the FDA.

After submission, the sponsor must wait 30 calendar days before initiating the trial. If the FDA does not place the study on clinical hold during that period, the trial may generally proceed.

In Europe, clinical trials involving medicinal products are governed by the Clinical Trials Regulation (EU) 536/2014.

New clinical trial applications within the European Union must be submitted through CTIS, the Clinical Trials Information System, which serves as a single entry point for sponsors and competent authorities.

For Medical Devices

The regulatory pathway differs for medical devices.

In the United States, a study involving a significant risk device requires an IDE, or Investigational Device Exemption, approved by the FDA, as well as IRB approval before study initiation.

In Europe, clinical investigations of medical devices fall under the MDR 2017/745 Regulation.

The ISO 14155 standard defines the good clinical practice requirements applicable to the design, conduct, recording, and reporting of clinical investigations involving medical devices in human subjects.

Good Clinical Practice as a Common Foundation

Regardless of the country, Good Clinical Practice remains the common foundation.

It governs participant protection, data quality, decision traceability, and the responsibilities of sponsors, investigators, and research sites.

The ICH E6(R3) version, adopted in January 2025, further reinforces principles related to quality by design, risk proportionate approaches, data governance, and the appropriate use of technology in clinical trials.

Preparing Data Collection Before First Patient In

A clinical trial does not begin only when regulatory approvals have been obtained.

It begins when teams are capable of collecting reliable, structured, and auditable data from the very first participant.

This preparation is often underestimated, yet it directly impacts study quality.

Before first patient enrollment, teams should:

  • Transform the protocol into an operational eCRF
  • Define forms, visits, and variables to be collected
  • Configure edit checks and consistency controls
  • Define rules for handling missing data
  • Configure user roles and access rights
  • Prepare queries
  • Test the investigator workflow
  • Verify expected exports
  • Ensure the presence of an audit trail
  • Train site teams

The objective is not simply to digitize a paper Case Report Form.

The goal is to structure data collection in order to reduce study corrections, minimize protocol deviations, and facilitate final analysis.

What Is the Role of a Clinical Research Site?

The research site is where the study is conducted with participants.

It is where patients are identified, informed, enrolled, monitored, and assessed.

A strong research site typically has:

  • A team trained on the protocol
  • An available investigator
  • Access to the target patient population
  • An organization compatible with planned visits
  • Experience conducting clinical studies
  • The ability to generate complete and consistent data

Site qualification, commonly referred to as site selection, is a critical step.

A site may appear suitable on paper but lack the time, resources, or patient population needed to enroll participants within the required timelines.

Study startup should therefore include a feasibility phase followed by the progressive activation of selected sites.

What Challenges Can Arise During the Startup Phase?

Launching a clinical trial involves several challenges.

Participant Recruitment

Recruitment remains one of the main causes of study delays.

Finding eligible, available, and willing participants often takes longer than expected.

To reduce this risk, teams should assess recruitment feasibility before study startup, define realistic inclusion criteria, prepare participant information materials, and closely monitor enrollment during the first weeks of the study.

Site Coordination

In a multicenter study, sites may interpret certain procedures differently.

These discrepancies can create inconsistencies in data collection.

Initial training, reference materials, data entry guidelines, and eCRF edit checks all contribute to harmonizing practices across sites.

Regulatory and Contractual Timelines

Regulatory submissions, ethics approvals, site contracts, and internal reviews can extend study timelines.

Teams should anticipate these activities and avoid delaying the preparation of the data collection environment.

Waiting until the final regulatory phase to build the eCRF creates a significant risk of delaying first patient enrollment.

Document Management

Document management becomes complex when versions of the protocol, informed consent forms, procedures, and site documents are not properly controlled.

Each version must be identified, approved, and communicated to the appropriate stakeholders.

Poor document management can lead to protocol deviations and weaken the auditability of the study.

Data Quality

A study may be approved, open, and actively recruiting, yet still generate data that are difficult to analyze if forms are poorly designed.

The most common issues include:

  • Ambiguous fields
  • Missing data
  • Non standardized units
  • Missing edit checks
  • Poorly structured visits
  • Incorrectly configured access rights
  • Incomplete exports

Data quality must be prepared before study startup.

Tools to Facilitate Clinical Trial Startup

To address these challenges, research teams increasingly rely on clinical trial management software.

An eCRF, Electronic Case Report Form, such as Datacapt, centralizes patient data entry and monitoring in real time, reduces errors, and facilitates audits.

These solutions provide valuable support for maintaining regulatory compliance while improving efficiency across all participating sites.

Choosing the right tools from the beginning significantly increases the likelihood of conducting a rigorous, successful, and well-controlled study.

Florentin Ory
CEO & Co-Founder

Florentin combines clinical research know-how with a true passion for product design. Attentive to detail and obsessed with user experience, he ensures that Datacapt remains a high-performance platform that’s also intuitive and accessible to every user.

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