Before you make a decision about a patient's care, you will want to review the available medical evidence. Evidence is clinically relevant information that you must assess to determine its quality.
Let's imagine you do a search in a medical database and find an article related to your clinical scenario.
The video below will explain the difference between "unfiltered" evidence such as a research study, and secondary "filtered" evidence such as a systematic review, which systematically searches for, evaluates, and summarizes all of the published research on a given clinical question to form an overall recommendation.