|The impact factor is the key tool for any journal. The impact factor of a journal is the number of times it is cited by an average article published in the magazine. Thus the impact factor of a journal in 2010 refers to the number of times articles published in that journal during the period 2008 and 2009 were cited in 2010. In short it is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period. It is a tool used to compare journals and assess the relative importance of a journal within a particular scientific field.
The impact factor is calculated by ISI (Institute of Scientific Information). The impact factor calculation has to be done with careful attention without which may hamper many phenomena that influence citation rates. This information can be published in our peer reviewed journal with impact factors. The journal of blood disorders & Transfusion has an good impact factor and are calculated using citations not only from research articles but also review articles (which tend to receive more citations), editorials, letters, meeting abstracts, short communications, and case reports.