Hi nyuszisue

I am not meaning to second-guess your rheumatologist but, writing as an immunologist, CRP is what is called an "acute-phase response" protein. That means that its levels go up when somebody has an inflammation from. typically, a bacterial infection. Its job is to bind to oligosaccharides (sugar polymers) on bacteria, which triggers their removal by the Alternative Complement Pathway, which is part of the innate immune system. Usually CRP levels go back to normal a few days after the infection has been dealt with.

I doubt, but could be wrong, that a cold or sinusitis would trigger an acute-phase response but, if so, CRP levels should go back to normal after you are over your cold or sinusitis.

If you have a chronic inflammatory disease, CRP may be chronically elevated.

You might find the information here helpful; http://www.webmd.com/a-to-z-guides/c...ve-protein-crp .

All the best.