Milligram per cent

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Milligram per cent is a traditional yet inappropriate symbol used to denote a unit of measure of concentration. The traditional (and inaccurate) use of the 'mg%' symbol was meant to indicate the mass (in milligrams) of that chemical in 100 milliliters of solution (e.g., blood). The meaning of the symbol 'percent' is '1/100', therefore the accurate meaning of the notation 'mg%' is 'mg/100', which is a unit of mass, not a concentration. Therefore, for Dimensional Analysis purposes, when denoting a concentration of mass divided by volume, one should use units such as 'mg/dL' or the International System of Units equivalent.

For example, a plasma ethanol concentration incorrectly denoted as 0.1 mg% can be written as '0.1mg/dL' (or '1mg/L', etc.) meaning a mass of 0.1 milligrams of ethyl alcohol per 100 milliliter volume of solution.