What a trial registration record has to contain

The record is a form, and the form is written down

A trial registration is often described as self-reported, and it is. That word gets read as unstructured, and it is not.

Federal regulation carries a list of the boxes a sponsor has to fill in. It also defines what belongs in each one.

The registry itself is a public data bank run by the National Library of Medicine, and the regulation says so in its own purpose section.

Submissions are electronic, in the format the registry specifies. There is no paper route and no summary version.

So a registry entry is not a press release with an identifier attached. It is a completed form, and a reader can ask which boxes were filled in.

One person owns the record, and the rule names four conditions

Every covered trial has exactly one responsible party, and the regulation says so in those words.

By default that is the sponsor. A sponsor is defined elsewhere in federal regulation as the person who starts an investigation without conducting it.

A sponsor can instead designate the principal investigator, and the designation is conditional on four things at once.

That person has to be responsible for conducting the trial. They must have access to and control over the data.

They must have the right to publish the results. And they must be able to meet every submission requirement in the rule.

The third of those is the one worth holding onto. Federal regulation treats the right to publish as a condition of being allowed to own the record.

The record also has to carry that party by official title and by contact information, and changes have to be sent in.

The clock starts at enrollment, not at publication

Registration is due within twenty-one calendar days after the first human subject is enrolled.

That word is defined too, and the definition reaches back into a different rulebook.

Enrolled means a person, or their legally authorized representative, agreed to take part after the informed consent process was completed.

Someone screened for eligibility who does not go on to take part is not enrolled, unless the protocol says otherwise.

So the registration clock is tied to the first real consent, which is the moment a study stops being a plan.

Once submitted, the agency posts the registration information publicly within thirty calendar days, apart from certain administrative data.

Twenty-four descriptive boxes

The descriptive group is the largest, and it runs from item (A) to item (X).

It holds a brief title and an official title, and a brief summary written in language intended for the lay public.

It holds the primary purpose, the study design, the study type, and, for a drug trial, the study phase.

Study design is itself several answers, including the number of arms, how people were allocated to them, and masking.

It holds the disease or condition being studied, and four separate boxes describing each intervention.

It holds the start date, the primary completion date, the study completion date, and the enrollment figure.

And it holds primary and secondary outcome measure information, each of which is three answers rather than one.

For every outcome measure, the sponsor names the measure, describes the metric used, and gives the time points at which it is assessed.

Two fields that dispose of a lot of arguments

Enrollment is defined as either the target number or the actual number, and the rule says which one is which.

Once the trial reaches its primary completion date, the responsible party must update the field to the actual number enrolled.

So an enrollment figure on a record has a state, and the record is supposed to say which state it is in.

Primary completion date has an equally exact meaning, and it is not the day a paper appeared.

It is the date the final subject was examined, or received an intervention, for the final collection of data on the primary outcome.

Where a trial has several primary outcomes with different completion dates, it is the date collection finished for all of them.

That definition matters because the results deadline is measured from it, which a separate article on this site covers.

Eight recruitment boxes, and the one nobody looks at

The recruitment group holds eligibility criteria, sex and gender, age limits, and whether healthy volunteers are accepted.

Eligibility criteria are defined as a limited list, in inclusion and exclusion terms, meant to help a potential subject recognize a relevant trial.

Overall recruitment status is the status of the trial as a whole, derived from the individual sites, and individual site status is recorded separately.

If at least one site in a multi-site trial is recruiting, the overall status has to say recruiting.

Then there is a field called why study stopped, and it exists for exactly one situation.

Where a trial is suspended, terminated, or withdrawn before the completion the protocol anticipated, the record must carry a brief explanation of the reasons.

A stopped trial with nothing in that box is a record with a required answer missing, which is a different thing from a mystery.

The last recruitment field records whether expanded access to the investigational product is available, which a separate article on this site explains.

Three contact boxes and six administrative ones

Location and contact information is short: the name of the sponsor, the responsible party by official title, and facility information.

Facility information means each participating site by name and location, with either a contact at each site or one central contact.

The administrative group is six items, and two of them answer questions readers actually have.

Human subjects protection review board status records whether an ethics board approved the trial, or whether such review is not required by law.

It has to read approved if at least one such board approved the trial, and the regulation names the ethics-board rules it means.

Record verification date is the date the responsible party last checked the whole entry, even where nothing was changed.

That single field is the difference between a record somebody maintains and a record somebody abandoned.

The remaining four are the sponsor’s own protocol identification number, any secondary identifier, the investigational application number if there is one, and contact details.

What the registration list does not include

Across that paragraph of the regulation, four words do not appear at all: results, peer review, conflict of interest, and consent.

That is a statement about one paragraph rather than about the registry, and two near misses show why the distinction matters.

Funding looks absent and is not. The definition of a secondary identifier requires a federal grant or contract number where the trial is federally funded.

Blinding looks absent and is not. It sits inside study design, under the heading masking.

The protocol itself is a genuine gap at this stage. The registration record carries the protocol’s identification number, not the document.

The document arrives later, if it arrives. A results record has to include a copy of the protocol and the statistical analysis plan, with amendments approved before submission.

The responsible party may redact personal information and trade secrets from those documents before filing them.

So the difference between a registered trial and a reported one is not only whether numbers appeared. It is whether the plan behind them ever became public.

Self-reported is not the same as unregulated

Nobody reviews the science in a registration before it goes up. That is accurate and it is where most descriptions stop.

One short section of the regulation goes further. Clinical trial information submitted by a responsible party must not be false or misleading in any particular.

The same section states the consequence in its next sentence, which is that a responsible party submitting false or misleading information faces civil monetary penalties or other remedies.

The statute behind the rule says the same thing in its own words, and a separate article on this site follows what can happen next.

Voluntary records are inside the rulebook too. A sponsor registering a trial that the rule does not cover still has to meet stated conditions.

None of that makes a registration a finding. It makes it a filing with a truthfulness duty attached, which is a real but narrow thing.

Reading a registry entry against the list

Start with the record verification date. It tells you when a human being last looked at the entry.

Read enrollment and ask whether it is a target or an actual figure, since the rule requires the switch after primary completion.

Read the primary completion date as the definition writes it, and notice how far in the past it is.

Read the outcome measure information in three parts, because the metric and the time point are as prescribed as the name.

If the record says the trial stopped, look for the reason the rule requires beside it.

And check the review board status, which is the only place in the registration form where an outside body appears at all.

Sources

Each document below is named as it names itself, with the date printed on that document rather than the day it was read.

1. 42 CFR 11.28 — What constitutes clinical trial registration information, including the descriptive, recruitment, location and administrative data elements — Office of the Federal Register, Electronic Code of Federal Regulations, August 2026
2. 42 CFR 11.10 — What definitions apply to this part, including responsible party, enrolled, completion date, enrollment, record verification date and study design — Office of the Federal Register, Electronic Code of Federal Regulations, August 2026
3. 42 CFR 11.24 — When must clinical trial registration information be submitted — Office of the Federal Register, Electronic Code of Federal Regulations, August 2026
4. 42 CFR 11.35 — By when will the NIH Director post clinical trial registration information — Office of the Federal Register, Electronic Code of Federal Regulations, August 2026
5. 42 CFR 11.6 — What are the requirements for the submission of truthful information — Office of the Federal Register, Electronic Code of Federal Regulations, August 2026
6. 21 CFR 50.3 — Definitions, including sponsor, investigator and legally authorized representative — Office of the Federal Register, Electronic Code of Federal Regulations, August 2026