D dimer: While d dimer is often used to help diagnose blood clots, it can also be elevated with inflammation. ... Read more Dr. Ed Friedlander Dr. Friedlander
Definition of regimen. 1  1a : a systematic plan (as of diet, therapy, or medication) especially when designed to improve and maintain the health of a patientb : a regular course of action and especially of strenuous training the daily regimen of athletes. 2  2 : government, rule. 3  3 : regime 1c.
Therefore, when used in medical situations, specifically for medications, it means that the medication is to be used only when needed, rather than on a consistent basis. PRN means as needed.. It stands for pro re nata which translates to in the circumstances.. It is routinely used by physicians in prescribing instructions to mean as needed for..