Clinical Trial Status Labels Explained: Recruiting, Active, and Completed

By the Regenerative Evidence Guide Team

Clinical trial status labels describe where a study sits in its enrollment timeline, not whether the treatment works. “Recruiting” means the study is currently signing up participants. “Active, not recruiting” means it is still running but closed to new sign-ups. “Completed” means the study has ended and no one is still being examined as part of it.

These three words are the most common labels you’ll see on a ClinicalTrials.gov record, but they’re part of a larger set of eight status categories, and none of them — on their own — say anything about safety, effectiveness, or results. The rest of this guide walks through the full set, the dates attached to every status, and what to do with that information once you have it.

A Quick Safety Note Before You Read Further

A study listing is a research record, not medical advice. If you’re deciding whether to start, stop, or change a treatment, that decision belongs with a qualified clinician who knows your health history. If you’re experiencing a medical emergency, contact your local emergency services rather than searching a trial registry.

What Are the Different Clinical Trial Recruitment Statuses?

ClinicalTrials.gov studies move through a small, fixed set of status labels. Reading them in order shows where “Recruiting,” “Active,” and “Completed” sit relative to everything else.

Not yet recruiting: The study has been registered and planned, but it hasn’t started signing up participants yet.
Recruiting: The study is currently looking for and enrolling participants.
Enrolling by invitation: The study is selecting participants from a specific, pre-identified group rather than accepting open sign-ups from the public.
Active, not recruiting: Participants are still being treated or followed, but the study is no longer accepting new participants.
Suspended: The study has been paused before completion, with the possibility that it may start again.
Terminated: The study was stopped early and will not resume. A study can be terminated for many reasons — funding, enrollment problems, or safety findings — and the listing itself does not say which.
Completed: The study has ended in the normal course of its plan, and no participants are still being examined or treated.
Withdrawn: The study was stopped before a single participant was enrolled.

A study can also show as “Unknown status” when its listed completion date has passed but the study team hasn’t confirmed an update. That’s a signal to check the record’s last-update date, not a status in its own right.

Why Do the Dates on a Study Record Matter as Much as the Status?

The status label is only half the picture. Every study record also carries a set of dates that tell you how current the information actually is:

Start date: When the study began enrolling or treating its first participant.
Primary completion date: When the last participant was examined or received their final assessment for the study’s main outcome measure. This can happen well before the whole study wraps up.
Completion date: When the last participant’s final visit occurred, including any longer-term follow-up beyond the primary outcome.
First posted date: When the study record first became publicly visible on ClinicalTrials.gov.
Last update posted date: The most recent date the study’s team edited the record — the single most useful date for judging how current a listing is.

A study labeled “Recruiting” with a last-update date from several years ago is a sign to treat that listing with extra caution. The status word may simply be stale.

What Does a Clinical Trial Status Label Not Tell You?

Keeping these two lists separate is the most useful habit you can build when reading a trial record.

What you can know from the status label and dates alone:

Where the study sits in its enrollment timeline — not started, actively enrolling, no longer enrolling, or finished
Roughly how old or current the listed information is
Whether the study’s own team has confirmed the record recently

What you cannot know from the status label alone:

Whether the treatment being studied is safe or effective
Whether the results were positive, negative, or mixed
Whether results have been posted, published, or reviewed by other researchers
Whether the study applies to your specific health situation, age, or diagnosis
Why a study was terminated or suspended, if it was

What Should You Do Based on a Study’s Status?

Here’s a simple decision path for the four statuses readers run into most often:

If the study is Recruiting and you’re interested in participating, the next step is contacting the study team listed on the record to ask about eligibility — not assuming the listing itself means the treatment is proven.
If the study is Active, not recruiting, enrollment is closed, but you can still note the primary completion date to estimate when results might eventually be posted.
If the study is Completed and results are posted, read the results section itself before drawing any conclusion — a completed study with posted results is a very different thing from a completed study with none.
If the study is Completed with no results posted, treat it as inconclusive for your purposes. Absence of posted results is not evidence that a treatment failed or succeeded — it may simply mean results haven’t been submitted yet.

A Practical Checklist Before You Bring a Study to a Research Contact

If you found a study that seems relevant to a condition you’re researching, this checklist helps you prepare a specific, useful question:

Write down the study’s NCT number (the identifier at the top of the record) so anyone you ask can pull up the exact same page.
Note the current status label and the last update posted date.
Check whether a “Results” section is posted on the record, or whether it says “No Results Posted.”
Write one specific question, such as “Is this study still open, and would I be eligible?” rather than a general one like “Is this treatment good?”
Bring the printed or saved record to a qualified research coordinator, your physician, or the contact listed on the study page — not a sales or intake line for a clinic offering the treatment.

Common Questions About Clinical Trial Status Labels

Does “Recruiting” mean a treatment is close to being approved?

No. A “Recruiting” label only means the study is currently enrolling participants. It says nothing about how far a treatment is from any regulatory approval, and many recruiting studies test approaches that are never approved for wider use.

Can a study’s status change after I first see it?

Yes. Study teams update their records as enrollment and follow-up progress, which is why the last update posted date matters as much as the status word itself. A status you saw last year may no longer be accurate today.

Is a “Completed” study proof that a treatment works?

No. “Completed” only means the study finished as planned and no one is still being examined as part of it. Whether the treatment worked depends on the results themselves, which may or may not be posted on the record yet.

Why would a study be listed as “Terminated” instead of “Completed”?

“Terminated” means the study stopped early and will not resume, for reasons the listing itself doesn’t always specify — funding, low enrollment, and safety findings are all possible causes. “Completed” means the study ran its full planned course.

What should I do if a study I’m interested in shows “Unknown status”?

Check the last update posted date first. An “Unknown status” label usually means the listed completion date has passed without a confirmed update from the study team, so the safest move is to look for a more recently updated study or contact the listed study team directly.

Where These Definitions Come From

The status categories and date fields described above come from ClinicalTrials.gov’s own guidance on learning about studies and how to read a study record. Because ClinicalTrials.gov periodically updates its site language, check the current wording on those two pages directly if you need to confirm exact definitions for a formal purpose. Our approach to sourcing foundation guides like this one is laid out on our editorial policy page.

For more on how this publication approaches regenerative-medicine evidence generally, see our Start Here guide and our page on how we research a topic before we publish about it.

Medical and Educational Disclaimer

This article is for general education only. It does not provide medical advice, diagnosis, or treatment recommendations, and it is not a substitute for a conversation with a qualified healthcare professional about your own situation. See our full medical disclaimer for details. Regenerative Evidence Guide is an independent educational publication. It is not affiliated with any former academy, faculty, conference, clinic, or training program that has operated under a similar name, and it does not offer treatment, credentials, or continuing education.

Page last updated: September 10, 2026.