Clinical guidelines are systematically developed statements that provide evidence-based recommendations for patient care in specific clinical situations. They help practitioners make consistent and appropriate decisions about medication management, diagnosis, and treatment for various diseases and conditions. Good guidelines are developed by experts and summarize large bodies of evidence to provide actionable advice.
Key Takeaway; Clinical guidelines:

Why are clinical guidelines important?
What are some other names for clinical practice guidelines?
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Some entries are bulleted or modular, others have links to an external site
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The United States Preventive Services Task Force
The USPSTF’s scope is to “make recommendations on clinical preventive services to primary care clinicians,” including screening tests, behavioral counseling, and preventive medications. The USPSTF recommendations only address services offered in primary care settings.
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The Agency for Healthcare Research and Quality is the agency in charge of improving the quality and safety. Their website "Guidelines and Measures" will search within all AHRQ sites and provide some access to guidelines.
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National Center for Complementary and Integrative Health: Clinical Practice Guidelines
Issued by third-party organizations, and not NCCIH, these guidelines define the role of specific diagnostic and treatment modalities in the diagnosis and management of patients. The statements contain recommendations that are based on evidence from a rigorous systematic review and synthesis of the published medical literature.
This is a list of resources grouped by subject matter. Click the links to access external websites containing guidelines.
Guidelines are published by a number of entities, the most trustworthy of which are educational institutions, medical institutions, and health organizations. You can search for clinical practice guidelines using a simple google search.
To search for .edu, .org, or .gov specific websites
Example: clinical guidelines for geriatric patients with diabetes site:.org
Therapeutic Research Center: Clinical Resource #36116
ACC/AHA Recommendation System: Applying Class of Recommendation and Level of Evidence to Clinical Strategies, Interventions, Treatments, or Diagnostic Testing in Patient Care. Use this table to determine what different levels of Class of Recommendations and Level of Evidence mean. Cick the image to enlarge.