Journal impactor factor is and indication of the quality of a journal. The higher the journal 'impact factor', the more important the journal. You can search for a journal's impact factor uon Google using the journal name and impact factor as keywords.
Some journal impact measures are based on the number of citing documents, and some tools also 'weight' these citations; new impact measures are emerging all the time. The best known journal measure is currently the Journal Impact Factor, generated by the Journal Citation Reports.
Note: An impact metric can only be generated if the journal is indexed by the database.
Some key Heath Sciences databases and Anatomy databases are listed below: