C-Reactive Protein scores below 0.2 are excellent. I'm not sure what is considered unhealthy or risky. Lower levels indicate low inflammation, which is obviously a good thing.

I was at the doctor this week and I had a CRP test and the results were 2 (i have had flu/cold symptoms for a month). I told him that was a lot higher than my last test which was <1. He said anything under 10 is fine, it starts to become a problem when 50-100, and he had seen a client that week with 250+. He said that it is an incredibly inaccurate test, as anything can increase it, such as a scratch or graze etc.

Anyway, .18 is very, very low, indicating hardly any inflammation. IMO, you have happy insides.

This doesn't quite answer your question, but that looks pretty normal rather than low, based on Wolfram Alpha's parsing of the NHANES data:

http://www.wolframalpha.com/input/?i=crp+reference+distribution

The lower the better, the ideal being zero in the standard CRP test.

If you have a low CRP result (as you do), you can get a more accurate test (if required) with the hs-CRP (High-sensitivity C-reactive protein) test.

"There are two different tests for CRP. The standard test measures a much wider range of CRP levels but is less sensitive in the lower ranges. The hs-CRP test can more accurately detect lower concentrations of the protein (it is more sensitive), which makes it more useful than the CRP test in predicting a healthy person's risk for cardiovascular disease."

Edit: actually, it looks like the CRP test you had done was the hs-crp test. I just read some info that says the standard CRP test measures CRP in the range from 10 to 1000 mg/L & the hs-crp test measures CRP in the range from 0.5 to 10 mg/L. source.