PR has various meanings in medicine, such as PR interval in ECG, progesterone receptor, protein, pulse rate, etc. It also indicates partial remission on tumor treatment. PR often appears in different departments, so you can directly consult with your treating doctor. PR in ECG is the time interval from the onset of the P wave to the onset of the QRS wave, i.e. PR interval. The progesterone receptor is also PR. PR can also be an abbreviation for protein and pulmonary regurgitation. The abbreviation for pulse rate is also PR, which stands for the number of pulse beats per minute.PR in oncology treatment stands for a 50% or greater reduction in the size of the mass after treatment, i.e., partial remission. PR has different meanings depending on where it appears in medicine, so you can consult directly with the doctor who issued the relevant documents and certificates.