Study Status vs. Posted Results on ClinicalTrials.gov: Reading Two Different Record Fields

A trial record that says “Completed” has not necessarily posted results. The recruitment status describes where the study stands. The results-first-posted date marks when summary results information became available on the registry. These are separate fields, filled in at different times, and a reader who treats them as one signal can draw the wrong conclusion about what a record shows.

This article separates those two fields from a third that is often confused with them, the last-update date. It then offers a short record-reading card you can apply to any ClinicalTrials.gov record before relying on it in a conversation with a clinician, a study contact, or your own notes.

What is the difference between study status and posted results?

Study status is a statement about the study as a whole. Posted results are a separate body of data, submitted by the sponsor or investigator, that describes participants and outcomes. A record can carry a status without results, and the registry tracks the two with their own dates.

The registry also separates submitting information from posting it. In 2017 the National Library of Medicine (NLM) renamed several date fields, for example “Results First Received” became “Results First Submitted,” so that submission dates would not be mistaken for posting dates. A record can therefore show a submission date and a posting date that do not match.

What does recruitment status tell you, and what does it leave out?

Recruitment status describes the stage of the study. University research-office guidance that follows the registry's categories describes “Completed” as a study that has concluded normally, with the last participant's last visit having occurred. “Withdrawn” is described as a study halted before enrolling its first participant. Labels such as “Recruiting” and “Active, not recruiting” describe the enrollment and follow-up stages in between.

Status does not tell you whether results exist, whether they have been posted, or what a study found. A “Completed” label describes how the study ran. It is not a finding.

What does “Results First Posted” mark?

The results-first-posted date is the registry's marker for when summary results information became available. Registry data documentation describes it in relation to NLM's quality control (QC) review, and notes that some results information can be available earlier, labeled as posted with QC comments. Because of that, a record's results date and an earlier QC-flagged version can both exist. The History of Changes is the place to check.

The timing rules come from federal regulation. An NLM webinar from October 2019 summarizes them this way:

Results information is to be submitted no later than one year after the study's primary completion date, with delayed submission permitted in specific circumstances (42 CFR 11.44).
NIH is to post submitted results within 30 calendar days of submission (42 CFR 11.52), even if QC review has not concluded.
When review has not concluded, the public record carries a general notice and brief standard comments identifying apparent errors, deficiencies, or inconsistencies.
The responsible party is to address those issues within 25 calendar days of electronic notification (42 CFR 11.64(b)).

Two limits matter. The webinar says the 30-day procedure applies to applicable clinical trials that started on or after January 18, 2017, with results first submitted after the implementation date, then estimated as January 2020. It also states that NLM staff assess submissions for apparent errors and inconsistencies but do not verify scientific validity or relevance. A posted result has been checked for completeness and consistency. It has not been independently confirmed as correct or meaningful.

Because the rules are written for applicable clinical trials and allow delays in specific circumstances, a missing results section does not, by itself, show that a deadline was missed.

What does “Last Update Posted” tell you?

A glossary of ClinicalTrials.gov terms describes the last update posted date as the most recent date on which changes to a study record were made available on the site. It can trail the “last update submitted” date, when the sponsor or investigator sent the changes.

This field covers the whole record, so it is the least specific of the dates. A recent last-update date can reflect a status change, a corrected contact, a revised outcome description, or new results. It does not say which. NLM added the field in 2017 because updated information was sometimes not publicly visible until after the older “last updated” date.

The record-reading card

Apply these four entries, in order, to any record. Write one line for each before drawing a conclusion.

Recruitment status. Copy the label exactly as shown. It is a statement about the study's stage. Record only what it supports, such as “the registry lists this study as completed.” Do not add “so it worked” or “so results exist.”
Results first posted. Find the date, or note that none is shown. A date marks when the registry shows summary results became available. Check the History of Changes for an earlier version posted with QC comments, and look for a notice that QC review has not concluded. If no date appears, write “no posted results shown on this record.” The reason is not visible from that absence alone.
Last update posted. Copy the date. It shows that something in the record changed, not what. If it is much later than the results date, the History of Changes is where to look for what moved.
Unresolved questions. List what the record leaves open. Examples: results are absent and the reason is unclear; the status and the dates seem out of step; results carry a notice that QC review has not concluded; the record does not say whether findings were published elsewhere; you cannot tell which version of an outcome description you are reading.

The fourth line is the most useful part of the card. A short, honest list of open questions is a better document to carry into a conversation than a confident but unsupported summary.

A worked example using the webinar's fictional record

The NLM webinar uses a fictional record, NCT11110000, to show how posting works. It is not a real study. In the example, results are submitted on January 18, 2020, and NLM returns QC comments on February 17, 2020, 30 days later. The sponsor resubmits on March 10, 2020. Until the issues are resolved, the public page carries a notice that quality control has not concluded. After that, the record is posted without comments and earlier versions are archived.

Applying the card: the status line gives the study's stage. The results line shows results are public but flagged. The last-update line reflects the later resubmission. The open-questions line notes that a specific measure lacked scale information at that point. Four separate facts came from one record, and none of them is a verdict on whatever was being studied.

Why read the History of Changes?

The webinar states that the registry's archive provides access to all posted versions of a record, including those with QC review issues. Comparing versions lets you see when a status changed, when results appeared, and whether an outcome description was revised. A study page's History tab, such as the one for NCT01802437, is the place to start. Compare versions before deciding that a recent update means new findings.

What this card cannot do

The card helps you read dates and labels accurately. It does not tell you whether a study was well designed, whether its results are reliable, or whether any intervention is right for any person. This article is educational and is not medical advice. Questions about whether a study or its findings apply to a personal situation belong with a qualified clinician or the study's listed contact. Registry records are written and updated by sponsors and investigators. One 2019 audit of investigator and responsible-party fields in drug and biological trials found missing or unusable entries in many records it examined. That audit did not examine status or results dates, but it is a reminder that a registry entry is a reading aid and not a verification of the study.

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By the Clinical Research Explained Editorial Team