ICH GCP | Clinical Trials Registry

On the Basic Search page, enter a word or word(s) that you want to use to find studies. These may include diseases, interventions, and/or locations.

Medical terms are often several words long, such as Percutaneous Coronary Intervention. To only find studies where the words are together as a phrase, put the term in quotes (e.g., "Percutaneous Coronary Intervention"). If you search for a multi-word term without quotes, studies with all words together as a phrase will appear higher in the results list than studies where the words are separated and spread throughout the document. For example, a search for Heart Attack will list a study about, higher than the study,
A search for "Heart Attack" would not find the second study. Synonyms are known for some terms and are used where possible. For example, a search for Heart Attack will also find occurrences of Myocardial Infarction.

Many searches are a single term and can be performed with a few words in the search box. But, sometimes you need more control. Click on the Advanced Search tab (if starting a new search) or Refine Search tab (if modifying an existing search) to show additional search fields.

The additional search fields can be used to limit your search results. Note that it is not necessary to fill in all the fields, only those that are needed for your search. If you are finding too few studies, consider clearing a field and searching again.

Search Terms:

Recruitment:
Study Results:
Study Type:
Conditions:

Interventions:

Outcomes Measures:

Sponsor/Collaborators:

Sponsor (Lead):

Study IDs:

Country/State:

Location Terms:

Gender:

Age Group:

Phase:

Funded By:

Safety Issue:

First Received:

Last Updated:

Searches display a list of studies found (List Results tab). If you are not content with the search results, click on the Refine Search tab at the top of the list to modify your search.

Add terms to empty fields to search within your current result. You can also add terms to fields that contain terms. For best results, use an AND (all upper case) as a separator between terms in the same field.

For example:

When you are done making changes, click Search to display the new results.

Use AND (all upper case) to find study records that contain all terms connected by AND.
For example:

Use OR (all upper case) to find study records that contain either term connected by OR.
For example:

Use NOT (all upper case) to find study records that do not contain the term following NOT.
For example:

Likewise, AND, OR, NOT, and parentheses can be used to create more complicated search expressions.
For example:

Note that the use of AND and OR as logical operators can be confusing.
An appropriate search for a list such as,
is the expression Fortunately, search will do a pretty good job of finding the right studies either way.

To search for AND as a word, instead of using it as an operator, put it in quotes.
Likewise, you can quote OR, NOT, and parentheses.