World MS Day @WorldMSDay. May 30th 2018. Bringing the world together to campaign with & for everyone affected by multiple sclerosis. An initiative of the MS International Federation.
Why It Is Done. A C-reactive protein (CRP) test is done to: 1  Check for infection after surgery. 2  CRP levels normally rise within 2 to 6 hours of surgery and then go down by the third day after surgery. 3  If CRP levels stay elevated 3 days after surgery, an infection may be present.
Best Answer: i have had to do many preps over the past 20+ yrs and it can take anywhere from 30 min. to as long as 4-5+ hours. trust me it is the worst part of the whole test. good luck. Source(s):