The normal level of CRP is less than 5 mg/L. The levels of CRP starts rising after 4-6 hours of inflammatory stimulus and keep doubling every 8 hours. Within 2-3 days, the CRP level reaches its peak. Again after 3 days, the levels of CRP reduce once the stimulus settles down. Doctor’s usually advised to take the CRP test again after 3 days to monitor the levels of CRP. The before and after test results are compared to understand either the improvement or deterioration of the infection.