Search filters


Filters are pre-written search strategies designed to retrieve a particular type of record. The Cochrane Highly Sensitive Search Strategy (HSSS) for identifying randomized trials in MEDLINE has been developed and tested and can be added to your search strategy to retrieve RCTs & quasi RCTS.

See Section 6.4.11 Search Filters of the Cochrane Handbook for full details of search filters and Section The Cochrane Highly Sensitive Search Strategies for identifying randomized trials in MEDLINE.


An Embase study design filter (see Identifying Embase RCTs and CCTs for inclusion in CENTRAL) has been created by the team involved in the Embase Project.

An Embase animal filter was developed by Anne Eisinga of the UK Cochrane Centre in 2013.

Non-Cochrane search filters