AHRQ Clinical Practice Guidelines Evidence-based research provides the basis for sound clinical practice guidelines and recommendations. The database of guidelines available from the National Guideline Clearinghouse and the recommendations of the U.S. Preventive Services Task Force are especially useful. Continue to the section. Current as of March 2013 Internet Citation: AHRQ Clinical Practice Guidelines. March 2013. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/redirects/AZRedirects/ClinPracGuide.html